Terrestrial carbon balance in tropical Asia: Contribution from cropland expansion and land management

Tao, Bo; Tian, Hanqin; Chen, Guangsheng; Ren, Wei; Lü, Chaoqun; Alley, Kelly D.; Xu, Xiaofeng; Liu, Mingliang; Pan, Shufen; Virji, Hassan

doi:10.1016/j.gloplacha.2012.09.006

Cited by 49 publications

(39 citation statements)

References 56 publications

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“…Thus, the C input and SOC turnover are highly variable across spatial-temporal distributions, making the assessment of cropland SOC change more complicated7. Although the recommended management practices (RMPs) have been widely suggested to benefit the soil health8, the direction and the magnitude of such RMPs to affect SOC dynamics have exhibited large disparities across time and space.…”

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confidence: 99%

Changes in soil organic carbon in croplands subjected to fertilizer management: a global meta-analysis

Han

Zhang

Wang

et al. 2016

Sci Rep

136

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Cropland soil organic carbon (SOC) is undergoing substantial alterations due to both environmental and anthropogenic changes. Although numerous case studies have been conducted, there remains a lack of quantification of the consequences of such environmental and anthropogenic changes on the SOC sequestration across global agricultural systems. Here, we conducted a global meta-analysis of SOC changes under different fertilizer managements, namely unbalanced application of chemical fertilizers (UCF), balanced application of chemical fertilizers (CF), chemical fertilizers with straw application (CFS), and chemical fertilizers with manure application (CFM). We show that topsoil organic carbon (C) increased by 0.9 (0.7–1.0, 95% confidence interval (CI)) g kg−1 (10.0%, relative change, hereafter the same), 1.7 (1.2–2.3) g kg−1 (15.4%), 2.0 (1.9–2.2) g kg−1 (19.5%) and 3.5 (3.2–3.8) g kg−1 (36.2%) under UCF, CF, CFS and CFM, respectively. The C sequestration durations were estimated as 28–73 years under CFS and 26–117 years under CFM but with high variability across climatic regions. At least 2.0 Mg ha−1 yr−1 C input is needed to maintain the SOC in ~85% cases. We highlight a great C sequestration potential of applying CF, and adopting CFS and CFM is highly important for either improving or maintaining current SOC stocks across all agro–ecosystems.

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confidence: 99%

Changes in soil organic carbon in croplands subjected to fertilizer management: a global meta-analysis

Han

Zhang

Wang

et al. 2016

Sci Rep

136

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“…Cropland NPP in China was estimated to increase from 159 TgC yr −1 in the 1960s to 513 TgC yr −1 in the 1990s based on the National Agriculture Database (Statistics Bureau of China 2000) (Huang et al, 2007), and this study estimated the range as 286 TgC yr −1 in the 1960s to 559 TgC yr −1 in the 1990s. In tropical Asia, the new croplands were mainly derived from forests, which caused large amounts of carbon loss from both vegetation and soil Tao et al, 2013;West et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Estimating global cropland production from 1961 to 2010

et al. 2017

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Abstract. Global cropland net primary production (NPP) has tripled over the last 50 years, contributing 17-45 % to the increase in global atmospheric CO 2 seasonal amplitude. Although many regional-scale comparisons have been made between statistical data and modeling results, long-term national comparisons across global croplands are scarce due to the lack of detailed spatiotemporal management data. Here, we conducted a simulation study of global cropland NPP from 1961 to 2010 using a process-based model called Vegetation-Global Atmosphere-Soil (VEGAS) and compared the results with Food and Agriculture Organization of the United Nations (FAO) statistical data on both continental and country scales. According to the FAO data, the global cropland NPP was 1.3, 1.8, 2.2, 2.6, 3.0, and 3.6 PgC yr −1 in the 1960s, 1970s, 1980s, 1990s, 2000s, and 2010s, respectively. The VEGAS model captured these major trends on global and continental scales. The NPP increased most notably in the US Midwest, western Europe, and the North China Plain and increased modestly in Africa and Oceania. However, significant biases remained in some regions such as Africa and Oceania, especially in temporal evolution. This finding is not surprising as VEGAS is the first global carbon cycle model with full parameterization representing the Green Revolution. To improve model performance for different major regions, we modified the default values of management intensity associated with the agricultural Green Revolution differences across various regions to better match the FAO statistical data at the continental level and for selected countries. Across all the selected countries, the updated results reduced the RMSE from 19.0 to 10.5 TgC yr −1 (∼ 45 % decrease). The results suggest that these regional differences in model parameterization are due to differences in socioeconomic development. To better explain the past changes and predict the future trends, it is important to calibrate key parameters on regional scales and develop data sets for land management history.

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“…The model used in this study is the DLEM 2.0. This is a grid‐based fully distributed model which couples major biogeochemical cycles, the water cycle, and vegetation dynamics to compute temporally and spatially explicit flux estimates of water, greenhouse gases (including CO 2 , CH 4 , and N 2 O), and element storage (carbon and nitrogen) in terrestrial ecosystems (Tian et al ., , , b, , ; Xu et al ., ; Ren et al ., ; Chen et al ., , ; Liu et al ., ; Lu and Tian, ; Tao et al ., ). The basic calculation unit in DLEM 2.0 is a grid cell with the spatial resolution of 5 × 5 arc‐min.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Throughout the development of DLEM, a plethora of field observations have been used to calibrate model parameters for simulations of carbon and water fluxes (Tian et al ., , , ; Ren et al ., ; Chen et al ., ; Lu and Tian, ; Tao et al ., ; Xu et al ., ). In the version (DLEM 2.0) used for this study, most of the parameters related to biogeochemical and plant physiological processes are the same as those used in our previous simulation in North America (Xu et al ., ).…”

Section: Simulation Experiments and Statistical Analysismentioning

confidence: 99%

Hydrological Responses to Climate and Land‐Use Changes along the North American East Coast: A 110‐Year Historical Reconstruction

Yang

Tian

Friedrichs

et al. 2014

J American Water Resour Assoc

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The North American east coast (NAEC) region experienced significant climate and land‐use changes in the past century. To explore how these changes have affected land water cycling, the Dynamic Land Ecosystem Model (DLEM 2.0) was used to investigate the spatial and temporal variability of runoff and river discharge during 1901‐2010 in the study area. Annual runoff over the NAEC was 420 ± 61 mm/yr (average ± standard deviation). Runoff increased in parts of the northern NAEC but decreased in some areas of the southern NAEC. Annual freshwater discharge from the study area was 378 ± 61 km3/yr (average ± standard deviation). Factorial simulation experiments suggested that climate change and variability explained 97.5% of the interannual variability of runoff and also resulted in the opposite changes in runoff in northern and southern regions of the NAEC. Land‐use change reduced runoff by 5‐22 mm/yr from 1931 to 2010, but the impacts were divergent over the Piedmont region and Coastal Plain areas of the southern NAEC. Land‐use change impacts were more significant at local and watershed spatial scales rather than at regional scales. Different responses of runoff to changing climate and land‐use should be noted in future water resource management. Hydrological impacts of afforestation and deforestation as well as urbanization should also be noted by land‐use policy makers.

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Terrestrial carbon balance in tropical Asia: Contribution from cropland expansion and land management

Cited by 49 publications

References 56 publications

Changes in soil organic carbon in croplands subjected to fertilizer management: a global meta-analysis

Changes in soil organic carbon in croplands subjected to fertilizer management: a global meta-analysis

Estimating global cropland production from 1961 to 2010

Hydrological Responses to Climate and Land‐Use Changes along the North American East Coast: A 110‐Year Historical Reconstruction

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