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Trends in grain yields and soil organic C in a long-term fertilization experiment in the China Loess Plateau

文献类型： 外文期刊

作者： Fan, Tinglu 2 ; Xu, Minggang 1 ; Song, Shangyou 2 ; Zhou, Guangye 4 ; Ding, Linping 4 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.Gansu Acad Agr Sci, Lanzhou 730070, Gansu, Peoples R China

3.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Agr Loess Plate, Yangling 712100, Peoples R China

4.Pingliang Prefecture Inst Agr Sci, Pingliang 744000, Gansu, Peoples R China

关键词： corn;grain yield;long-term fertilization;soil organic carbon;wheat;China Loess Plateau;LIGHT-FRACTION;MANAGEMENT;CARBON;MATTER;DYNAMICS;CROP

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE （ 影响因子：2.426； 五年影响因子：3.029 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Changes in grain yields and soil organic carbon (SOC) from a 26 y dryland fertilization trial in Pingliang, Gansu, China, were recorded. Cumulative C inputs from straw and root and manure for fertilizer treatments were estimated. Mean wheat (Triticum aestivum L.) yields for the 18 y ranged from 1.72 t ha(-1) for the unfertilized plots (CK) to 4.65 t ha(-1) for the plots that received manure (M) annually with inorganic N and P fertilizers (MNP). Corn (Zea mays L.) yields for the 6 y averaged 2.43 and 5.35 t h(-1) in the same treatments. Yields declined with year except in the CK for wheat. Wheat yields for N only declined with time by 117.8 kg ha(-1) y(-1) that was the highest decrease among all treatments, and that for NP declined by 84.7 kg ha(-1) y(-1), similar to the declines of 77.4 kg ha(-1) y(-1) for the treatment receiving straw and N annually and P every second year (SNP). Likewise, the corn yields declined highly for all treatments, and the declined amounts ranged from 108 to 258kg ha(-1) y(-1) which was much higher than in wheat. These declined yields were mostly linked to both gradual dry weather and nutrients depletion of the soil. The N only resulted in both P and K deficiency in the soil, and soil N and K negative balances in the NP and MNP were obvious. Soil organic carbon (SOC) in the 0-20cm soil layer increased with time except in the CK and N treatments, in which SOC remained almost stable. In the MNP and M treatments, 24.7% and 24.0% of the amount of cumulative C input from organic sources remained in the soil as SOC, but 13.7% of the C input from straw and root in the SNP, suggesting manure is more effective in building soil C than straw. Across the 26 y cropping and fertilization, annual soil-C sequestration rates ranged from 0.014 t C h(-1) y(-1) for the CK to 0.372 t C ha(-1) y(-1) for the MNR We found a strong linear relationship (R-2 = 0.74, p = 0.025) between SOC sequestration and cumulative C input, with C conversion-to-SOC rate of 16.9%, suggesting these dryland soils have not reached an upper limit of C sequestration.

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