Long-term straw decomposition in agro-ecosystems described by a unified three-exponentiation equation with thermal time

doi:10.1016/j.scitotenv.2018.04.303

	Long-term straw decomposition in agro-ecosystems described by a unified three-exponentiation equation with thermal time
	Cai, Andong 1,2; Liang, Guopeng 2; Zhang, Xubo 3; Zhang, Wenju 1; Li, Ling 1; Rui, Yichao 4; Xu, Minggang 1; Luo, Yiqi 2,5
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2018-09-15
卷号	636 页码:699-708
关键词	Straw decomposition Straw properties Soil properties Climate Agro-ecosystem
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2018.04.303
通讯作者	Xu, Minggang(xuminggang@caas.cn)
英文摘要	Understanding drivers of straw decomposition is essential for adopting appropriate management practice to improve soil fertility and promote carbon (C) sequestration in agricultural systems. However, predicting straw decomposition and characteristics is difficult because of the interactions between many factors related to straw properties, soil properties, and climate, especially under future climate change conditions. This study investigated the driving factors of straw decomposition of six types of crop straw including wheat, maize, rice, soybean, rape, and other straw by synthesizing 1642 paired data from 98 published papers at spatial and temporal scales across China. All the data derived from the field experiments using little bags over twelve years. Overall, despite large differences in climatic and soil properties, the remaining straw carbon (C, %) could be accurately represented by a three-exponent equation with thermal time (accumulative temperature). The lignin/nitrogen and lignin/phosphorus ratios of straw can be used to define the size of labile, intermediate, and recalcitrant C pool. The remaining C for an individual type of straw in the mild-temperature zone was higher than that in the warm-temperature and subtropical zone within one calendar year. The remaining straw C after one thermal year was 40.28%, 37.97%, 37.77%, 34.71%, 30.87%, and 27.99% for rice, soybean, rape, wheat, maize, and other straw, respectively. Soil available nitrogen and phosphorus influenced the remaining straw C at different decomposition stages. For one calendar year, the total amount of remaining straw C was estimated to be 29.41 Tg and future temperature increase of 2 degrees C could reduce the remaining straw C by 1.78 Tg. These findings confirmed the long-term straw decomposition could bemainly driven by temperature and straw quality, and quantitatively predicted by thermal time with the three-exponent equation for a wide array of straw types at spatial and temporal scales in agro-ecosystems of China. (C) 2018 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[41571298] ; National Natural Science Foundation of China[41620104006] ; National Natural Science Foundation of China[U1710255]
WOS关键词	SOIL ORGANIC-MATTER ; BIOENERGY BY-PRODUCTS ; LITTER DECOMPOSITION ; CARBON SEQUESTRATION ; CHINA CROPLANDS ; PLANT LITTER ; DYNAMICS ; MODEL ; TEMPERATURE ; MANAGEMENT
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000436599000067
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/54308]
专题	中国科学院地理科学与资源研究所
通讯作者	Xu, Minggang
作者单位	1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Engn Lab Improving Qual Arable Land, Beijing 100081, Peoples R China 2.No Arizona Univ, Dept Biol Sci, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100081, Peoples R China 4.Univ Wisconsin, Dept Soil Sci, Madison, WI 53705 USA 5.Tsinghua Univ, Dept Earth Syst Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Cai, Andong,Liang, Guopeng,Zhang, Xubo,et al. Long-term straw decomposition in agro-ecosystems described by a unified three-exponentiation equation with thermal time[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,636:699-708.
APA	Cai, Andong.,Liang, Guopeng.,Zhang, Xubo.,Zhang, Wenju.,Li, Ling.,...&Luo, Yiqi.(2018).Long-term straw decomposition in agro-ecosystems described by a unified three-exponentiation equation with thermal time.SCIENCE OF THE TOTAL ENVIRONMENT,636,699-708.
MLA	Cai, Andong,et al."Long-term straw decomposition in agro-ecosystems described by a unified three-exponentiation equation with thermal time".SCIENCE OF THE TOTAL ENVIRONMENT 636(2018):699-708.