Evaluation of the CENTURY Model Using Long-Term Fertilization Trials under Corn-Wheat Cropping Systems in the Typical Croplands of China

被引:21
作者
Cong, Rihuan [1 ,2 ]
Wang, Xiujun [3 ,4 ]
Xu, Minggang [1 ]
Ogle, Stephen M. [5 ]
Parton, William J. [5 ]
机构
[1] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr, Key Lab Crop Nutr & Fertilizat, Beijing 100193, Peoples R China
[2] Huazhong Agr Univ, Coll Resources & Environm, Wuhan, Peoples R China
[3] Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi, Peoples R China
[4] Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA
[5] Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA
基金
美国国家科学基金会;
关键词
SOIL ORGANIC-CARBON; SIMULATING SOC CHANGES; NORTHERN CHINA; CLIMATE-CHANGE; FOOD SECURITY; DNDC MODEL; NO-TILLAGE; SEQUESTRATION; NITROGEN; DYNAMICS;
D O I
10.1371/journal.pone.0095142
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Soil organic matter models are widely used to study soil organic carbon (SOC) dynamics. Here, we used the CENTURY model to simulate SOC in wheat-corn cropping systems at three long-term fertilization trials. Our study indicates that CENTURY can simulate fertilization effects on SOC dynamics under different climate and soil conditions. The normalized root mean square error is less than 15% for all the treatments. Soil carbon presents various changes under different fertilization management. Treatment with straw return would enhance SOC to a relatively stable level whereas chemical fertilization affects SOC differently across the three sites. After running CENTURY over the period of 1990-2050, the SOC levels are predicted to increase from 31.8 to 52.1 Mg ha(-1) across the three sites. We estimate that the carbon sequestration potential between 1990 and 2050 would be 9.4-35.7 Mg ha(-1) under the current high manure application at the three sites. Analysis of SOC in each carbon pool indicates that long-term fertilization enhances the slow pool proportion but decreases the passive pool proportion. Model results suggest that change in the slow carbon pool is the major driver of the overall trends in SOC stocks under long-term fertilization.
引用
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页数:13
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