Article
Environmental Sciences
Xiaojie Gao, Ian R. R. McGregor, Josh M. M. Gray, Mark A. A. Friedl, Minkyu Moon
Summary: Vegetation green leaf phenology has a direct impact on the gross primary productivity (GPP) of terrestrial ecosystems. Satellite observations of land surface phenology (LSP) provide a valuable tool for monitoring the timing of vegetation green leaf development. However, discrepancies between satellite-derived LSP proxies and in situ measurements of GPP make it challenging to quantify the effects of climate-induced changes in green leaf phenology on annual GPP.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Ecology
Huiying Liu, Chunyan Lu, Songdan Wang, Fei Ren, Hao Wang
Summary: The research found that experimental warming did not significantly affect the duration of the reproductive phases of terrestrial plants globally, but did lead to a lengthening of the growing season. The temperature sensitivity of reproductive phases was influenced by the taxa of plants, and the lengthening of the growing season was affected by the magnitude of warming.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2021)
Article
Ecology
Christian Korner, Patrick Mohl, Erika Hiltbrunner
Summary: The concept of growing season in terrestrial ecosystems, which determines plant biomass production, lacks a well-defined definition. This study shows different aspects of growing season, including the actual growth period of plants, the period defined by phenological markers, the period of vegetation achieving net primary production, and the potential growth period based on meteorological criteria. The duration of this "window of opportunity" is a strong predictor for global net primary production, especially in forests. These different definitions have important implications for understanding and modeling plant growth and biomass production, challenging the common view that phenology is a proxy for productivity variation.
Article
Environmental Sciences
Jiangshan Zheng, Xiyan Xi, Gensuo Jia
Summary: This study investigates the effects of shifts in the start of the growing season on carbon uptake in high-latitude ecosystems. It finds that an earlier start of the growing season leads to increased carbon uptake in the early season, but slightly decreased carbon uptake in the late season. This is due to the warmer and drier conditions in the early season, which improve vegetation water use efficiency and enhance photosynthesis. However, the dry conditions persist in the late season and reduce vegetation water use efficiency, resulting in a slight decrease in photosynthesis.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Editorial Material
Environmental Sciences
Gesche Blume-Werry
Summary: Plants respond differently to warming in terms of leaf and root phenology, with a meta-analysis showing that the two do not necessarily correlate within the same plant types.
NATURE CLIMATE CHANGE
(2022)
Article
Agronomy
Zhongxi Ge, Jing Huang, Xufeng Wang, Yinjun Zhao, Xuguang Tang, Yun Zhou, Peiyu Lai, Binfei Hao, Mingguo Ma
Summary: The study shows that the predictive ability of various models varies with different sensor data and biomes. Recently proposed methods did not perform as expected, with some even performing worse than commonly used approaches. POS modeled from MODIS data performed slightly better than that from SPOT-VGT data. When the models are combined, they can reliably estimate POS for grasslands, deciduous broadleaf forests, and open shrublands, but not necessarily for other biomes.
AGRICULTURAL AND FOREST METEOROLOGY
(2021)
Article
Environmental Sciences
Jin-Soo Kim, Jong-Seong Kug, Sujong Jeong, Jin-Ho Yoon, Ning Zeng, Jinkyu Hong, Jee-Hoon Jeong, Yuan Zhao, Xiaoqiu Chen, Mathew Williams, Kazuhito Ichii, Gabriela Schaepman-Strub
Summary: The study found that winter warming in the Barents-Kara Sea region has led to negative temperature anomalies and leaf area index anomalies in most areas of East Asia, especially in the subtropical evergreen forests of southern China. These anomalies have also impacted spring vegetation activity and gross primary productivity.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Biochemistry & Molecular Biology
Yuxin Qiao, Hongshuang Gu, Hanfeng Xu, Qimei Ma, Xin Zhang, Qin Yan, Jie Gao, Yuchuan Yang, Sergio Rossi, Nicholas G. Smith, Jianquan Liu, Lei Chen
Summary: The phenological changes induced by climate warming have significant impacts on water, energy, and carbon cycling in forest ecosystems. Our study reveals that growing-season warming advances spring and autumn phenology, but the accelerating effects of warming on tree phenology gradually disappear, resulting in delayed phenological events. We also found a synchronized decline in the effect of growing-season warming on photosynthetic productivity.
Article
Environmental Sciences
Jilin Yang, Xiangming Xiao, Russell Doughty, Miaomiao Zhao, Yao Zhang, Philipp Kohler, Xiaocui Wu, Christian Frankenberg, Jinwei Dong
Summary: This study used TROPOMI SIF data to estimate SOS and EOS in the Tibetan Plateau and compared them with metrics derived from VIs and VPM. The results showed small discrepancies in SOS between SIF and VIs, but large differences in EOS. Additionally, VIs-based EOS occurred below the freezing point, while SIF-based EOS occurred above, suggesting the physiological significance of SIF-based EOS. These findings highlight the need to re-evaluate current LSP data products derived from VIs and develop new phenology data products using emitted energy such as SIF.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
Dujuan Ma, Xiaodan Wu, Xuanlong Ma, Jingping Wang, Xingwen Lin, Cuicui Mu
Summary: The study demonstrated that the MOD17A2H product accurately captured the variations of GPP in the Arctic, showing consistency with in situ measurements and functional phenology. Spatial patterns and interannual trends of GPP were found to be partly related to land cover types, latitude, and elevation, peaking in forests and lowest in grasslands.
Article
Environmental Sciences
Ye Yuan, Anming Bao, Guli Jiapaer, Liangliang Jiang, Philippe De Maeyer
Summary: This study analyzed the impact of climate variability and past states on vegetation growth during different seasons, and quantified the relative importance of climatic factors and vegetation growth carryover effect. The study found that climate variability had a greater impact during the green-up period, while the influence diminished over the season. On the other hand, the vegetation growth carryover effect showed the opposite pattern. Furthermore, the relative influence of different climatic factors varied between sub-seasons.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Environmental Sciences
Zhangze Liao, Binghuang Zhou, Jingyu Zhu, Hongyu Jia, Xuehai Fei
Summary: This study comprehensively reviewed the methods for estimating gross primary productivity (GPP) of terrestrial ecosystems at different scales, including ground observations, model simulations, SIF-based GPP, and NIRv-based GPP. The advantages and limitations of each method were compared and analyzed. The findings of this study can provide valuable references for researchers to understand and select appropriate models for assessing forest ecosystem GPP, as well as for formulating and implementing carbon neutralization accounting and local carbon emission reduction policies.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Environmental Sciences
Haihua Chen, Jianjun Zhao, Hongyan Zhang, Zhengxiang Zhang, Xiaoyi Guo, Meiyu Wang
Summary: Global climate change has caused significant changes in land surface phenology. Research has shown that the start of the growing season in the Northern Hemisphere is influenced by multiple factors, including frost frequency, temperature, and humidity. Understanding these factors and their thresholds is crucial for understanding the response of the growing season to climate change.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geography, Physical
Ying Liu, Chaoyang Wu, Xiaoyue Wang, Rachhpal S. Jassal, Alemu Gonsamo
Summary: Precipitation has the greatest impact on maximum vegetation growth, while temperature contributes the most to changes in peak of growing season. The effects of cloud cover vary depending on moisture regime, with more cloud cover delaying peak growth in wetter regions but advancing it in dry areas.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Environmental Sciences
Zhiguang Chen, Miaogen Shen, Nan Jiang, Jin Chen, Yanhong Tang, Song Gu
Summary: Daytime warming can delay the end of the vegetation growing season on the Tibetan Plateau, despite the inhibitory effect of low temperatures on alpine vegetation activity. Researchers should take into account the interactive effects of temperature and precipitation on the timing of the growing season when modeling autumn phenology in this region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Ecology
Qian Li, Yuemin Yue, Siyu Liu, Martin Brandt, Zhengchao Chen, Xiaowei Tong, Kelin Wang, Jingyi Chang, Rasmus Fensholt
Summary: Mapping forests with low cost high-resolution satellite images based on crown structure allows for accurate characterization of forest classes, supporting sustainable forest management and restoration activities.
REMOTE SENSING IN ECOLOGY AND CONSERVATION
(2023)
Article
Geography, Physical
Ying Hu, Fangli Wei, Bojie Fu, Shuai Wang, Lanhui Wang, Yongzhe Chen
Summary: The water cycle is accelerating in the context of global warming, with different causal relationships observed in different subtypes of drylands.
PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT
(2023)
Article
Thermodynamics
Feng Tian, Junlei Wang, Zhenhua Xu, Fansheng Xiong, Peng Xia
Summary: This paper proposes a nonlinear model of multifractured horizontal wells in heterogeneous gas reservoirs considering stress-sensitive effects. The effects of stress sensitivity, production settings, and subblock number are analyzed. It is found that stress sensitivity mainly affects wellbore pressure in the middle and later stages of production, reducing the pressure in a two-block reservoir by approximately 1%-28.2%. A reasonable production rate should be set to weaken the stress-sensitive effects on pressure loss and achieve higher cumulative production. For a three-block reservoir, increasing fracture parameters in low permeability blocks can mitigate the effects of heterogeneity and make the development more uniform. This paper provides a theoretical basis for improving gas production performance forecasting for efficient development of natural gas.
Article
Environmental Sciences
Yujie Dou, Feng Tian, Jean-Pierre Wigneron, Torbern Tagesson, Jinyang Du, Martin Brandt, Yi Liu, Linqing Zou, John S. Kimball, Rasmus Fensholt
Summary: Vegetation optical depth (VOD) from satellite passive microwave sensors has been used to monitor aboveground biomass carbon dynamics. However, uncertainty in the relationship between VOD and biomass carbon arises from changes in water stress and moisture content. This study evaluated the reliability of using VOD from different frequencies and temporal aggregation methods for estimating decadal biomass carbon dynamics at the global scale.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Environmental Sciences
Huan Wang, Jean-Pierre Wigneron, Philippe Ciais, Yitong Yao, Lei Fan, Xiangzhuo Liu, Xiaojun Li, Julia K. Green, Feng Tian, Shengli Tao, Wei Li, Frederic Frappart, Clement Albergel, Mengjia Wang, Shuangcheng Li
Summary: Vegetation optical depth (VOD) is sensitive to plant water content and aboveground biomass. It has strong penetrability within the vegetation canopy and is less impacted by atmosphere aerosol contamination effects, clouds and sun illumination. However, VOD retrieval over dense forests is subject to uncertainties and a comprehensive evaluation of VOD products is needed for accurate applications.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Biodiversity Conservation
Christin Abel, Abdulhakim M. Abdi, Torbern Tagesson, Stephanie Horion, Rasmus Fensholt
Summary: Increasing aridity due to global climate change has significant impacts on dryland ecosystems. We analyzed aridity trends from 2000 to 2020 and found that 44.5% of areas are getting drier, 31.6% are getting wetter, and 23.8% show no change. Ecosystem responses to aridity trends vary depending on the presence of water-related stress.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Geography, Physical
Yumiao Wang, Luwei Feng, Zhou Zhang, Feng Tian
Summary: Accurate crop type mapping is crucial for crop growth monitoring and yield estimation. A deep adaptation crop classification network (DACCN) was developed based on unsupervised domain adaptation to address the issue of domain shift. The DACCN outperformed other models in most transfer cases and showed better performance in spatially continuous mapping.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2023)
Article
Environmental Sciences
Linqing Zou, Feng Tian, Tianchen Liang, Lars Eklundh, Xiaoye Tong, Torbern Tagesson, Yujie Dou, Tao He, Shunlin Liang, Rasmus Fensholt
Summary: The upper elevational limits of vegetation growth in global high-mountains have been studied using two independent methods based on satellite remote sensing data and land cover dataset. The results demonstrate that mountain height is the dominant factor in determining the upper elevational limits of tree and vegetation lines globally, while climatic conditions and soil properties also play important roles at regional scales.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Wenmin Zhang, Guy Schurgers, Josep Penuelas, Rasmus Fensholt, Hui Yang, Jing Tang, Xiaowei Tong, Philippe Ciais, Martin Brandt
Summary: The impact of tropical temperature fluctuations on the growth rate of atmospheric CO(2) is no longer significant in recent decades. This is primarily due to increased precipitation, which has weakened the link between the carbon cycle and tropical temperature variation.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Lanhui Wang, Fangli Wei, Jens-Christian Svenning
Summary: Intact forests and protected areas are crucial for global biodiversity conservation and nature-based climate change mitigation. However, the expansion of croplands threatens their ecological integrity and resilience. Satellite observations reveal that a significant portion of croplands have been gained in remaining forests globally, particularly in high-integrity forests, non-forest biomes, and tropical forests. The expansion of croplands in forests has doubled in recent years and even a quarter of croplands in protected areas have experienced accelerated expansion. These findings highlight the insufficient protection of these critical landscapes and the urgent need for coordinated efforts among sustainable development goals.
Article
Geosciences, Multidisciplinary
Hui Yang, Philippe Ciais, Frederic Frappart, Xiaojun Li, Martin Brandt, Rasmus Fensholt, Lei Fan, Sassan Saatchi, Simon Besnard, Zhu Deng, Simon Bowring, Jean-Pierre Wigneron
Summary: Changes in terrestrial carbon storage under environmental and land-use changes are crucial for regional and global carbon budgets. This study used L-band microwave vegetation optical depth to generate global maps of annual live vegetation biomass, and found that boreal and temperate forests contribute the most to the global carbon sink, while wet tropical forests serve as small carbon sources. Additionally, the study revealed that tropical deforested and degraded old-growth forests are nearly carbon neutral, while young and middle-aged forests in temperate and boreal regions are the largest sinks.
Article
Environmental Sciences
Meiduan Zheng, Haijun Luan, Guangsheng Liu, Jinming Sha, Zheng Duan, Lanhui Wang
Summary: The optimal selection of characteristic bands and retrieval models for the hyperspectral retrieval of soil heavy metal concentrations is a significant challenge. This study tested various linear and nonlinear models to retrieve soil arsenic content using ground-based soil full spectrum data on Pingtan Island. The results showed that the Random Forest Regression (RFR) model consistently outperformed others, and the Geographically Weighted Regression (GWR) model, which considers spatial non-stationarity and heterogeneity, showed notable improvement in performance.
Article
Environmental Sciences
Hongxiao Jin, Sergio M. Vicente-Serrano, Feng Tian, Zhanzhang Cai, Tobias Conradt, Boris Boincean, Conor Murphy, Begona Alvarez Farizo, Sam Grainger, Juan I. Lopez-Moreno, Lars Eklundh
Summary: The study reveals that vegetation sensitivity to drought increases as the canopy develops throughout the year. Soil water shortage exacerbates vegetation-drought sensitivity temporally. Vegetation-drought sensitivity strongly correlates with vapor pressure deficit and partially with atmospheric CO2 concentration.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Soren J. Kragh, Rasmus Fensholt, Simon Stisen, Julian Koch
Summary: Despite limited knowledge of irrigation water usage, the implementation of a novel ensemble methodology combining different products has successfully estimated the precision of irrigation quantification in the Indus and Ganges basins. The study found that the net irrigation amounts to 233 mm yr(-1) (74 km3 yr(-1)) in the Indus Basin and 101 mm yr(-1) (67 km3 yr(-1)) in the Ganges Basin. The research also highlighted the robustness of the applied multi-model calibration approach and the importance of reducing uncertainty in evapotranspiration for accurate irrigation quantification.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Engineering, Geological
Liu Bin-hui, Yang Jun, Tian Feng, Fu Qiang
Summary: The influence mechanism of roadside roof cutting on the caving characteristics of lower stope strata is of great significance. This study analyzed the stope support load, carried out mechanical modeling of the overlying strata, and clarified the relationship between the movement of the overlying strata and the stope support load characteristics at typical positions. Load data of supports at typical positions were analyzed for six working faces with roadway side roof cutting, and a numerical model was established to further analyze the effect of roadside roof cutting on the collapse of the lower strata. The research results deepen the understanding of the effect of roadside roof cutting on the caving characteristics of the lower stope strata.
ROCK AND SOIL MECHANICS
(2023)
