首页|Changes in aggregate-associated organic carbon and nitrogen after 27 years of fertilization in a dryland alfalfa grassland on the Loess Plateau of China

Changes in aggregate-associated organic carbon and nitrogen after 27 years of fertilization in a dryland alfalfa grassland on the Loess Plateau of China

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Changes in the distribution of soil aggregate sizes and concentrations of aggregate-associated organic carbon (OC) and nitrogen (N) in response to the fertilization of grasslands are not well understood.Understanding these changes is essential to the sustainable development of artificial grasslands.For understanding these changes,we collected soil samples at 0-20 and 20-40 cm depths from a semi-arid artificial alfalfa grassland after 27 years of applications of phosphorus (P) and nitrogen+phosphorus+manure (NPM) fertilizers on the Loess Plateau of China.The distribution of aggregate sizes and the concentrations and stocks of OC and N in total soils were determined.The results showed that NPM treatment significantly increased the proportions of ＞2.0 mm and 2.0-0.25 mm size fractions,the mean geometric diameter (MGD) and the mean weight diameter (MWD) in the 0-20 cm layer.Phosphorous fertilizer significantly increased the proportion of ＞2.0 mm size fractions,the MGD and the MWD in the 0-20 cm layer.Long-term application of fertilization (P and NPM) resulted in the accumulation of OC and N in soil aggregates.The largest changes in aggregate-associated OC and N in the 0-20 cm layer were found at the NPM treatment,whereas the largest changes in the 20-40 cm layer were found at the P treatment.The results suggest that long-term fertilization in the grassland leads to the accumulation of OC and N in the coarse size fractions and the redistribution of OC and N from fine size fractions to coarse size fractions.

alfalfa grasslandlong-term fertilizationnitrogenorganic carbonsemi-arid Loess Plateau

ZHANG Liqiong、WEI Xiaorong、HAO Mingde、ZHANG Meng

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College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China

College of Agriculture and Life Sciences, Ankang University, Ankang 725000, China

State Key Laboratory of Soil Erosion and Dryland Farming in the Loess Plateau, Northwest A&F University, Yangling 712100, China

Program for New Century Excellent Talents in UniversityProgram from Northwest A&F UniversityNational Basic Research Program of ChinaNational Science and Technology Support for Major Projects of ChinaKnowledge Innovation Program of the Chinese Academy of SciencesScience and Technology Generalized Program for the Overall Development of Agriculture in NingxiaScientific Research Program from Education Department of Shaanxi Province

NCET-13-04872014YQ0072009CB1186042011BAD31B01KZCX2-YW-JC408NTKJ-2014-0111JK0650

2015

10.1007/s40333-015-0003-6

干旱区科学
中国科学院新疆生态与地理研究所,科学出版社

干旱区科学

CSTPCDCSCDSCI
影响因子：1.743
ISSN：1674-6767
年,卷(期)：2015.7(4)
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