Long term effects of fertilization on carbon and nitrogen sequestration and aggregate associated carbon and nitrogen in the Indian sub-Himalayas
Long term effects of fertilization on carbon and nitrogen sequestration and aggregate associated carbon and nitrogen in the Indian sub-Himalayas
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DOI：
10.1007/s10705-009-9270-y
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发表时间：
2010-01-01
影响因子：
3.1
通讯作者：
Mitra, S.
中科院分区：
文献类型：
--
作者：
Bhattacharyya, Ranjan;Prakash, Ved;Mitra, S.
了解耕作方式对土壤有机碳（SOC）动态的影响，对于维持土壤生产力和抑制CO2排放引起的全球变暖至关重要。在印度喜马拉雅山种植大豆（Glycine max L.）的长期（30年）试验结果-小麦（Triticum aestivum L.）分析了轮作对土壤有机碳和全氮储量及其在不同团聚体粒级中分布的影响，确定了10 Mg ha（-1）的无机肥和农家肥（FYM）施用量。大豆种植前每年施氮、氮、磷、钾化肥及FYM配施N或NPK，小麦种植前不施任何养分。结果表明，FYM与N、NPK配施均提高了土壤有机碳和可溶性固形物含量。30年来，NPK + FYM处理的土壤有机碳在0 ~ 45 cm土层的总增加量为17.18 Mg C ha（-1）。每公顷增加镁碳输入，输入碳向有机碳的转化率约为19%。大粒径团聚体中SOC含量大于小粒径团聚体，且随团聚体粒径的减小而降低。因此，在印度喜马拉雅山的桑迪壤土中，长期的大豆-小麦轮作隔离了碳和氮。0.25- 0.1-mm粒级的土壤有机碳和TSN固存是长期碳和氮固存的理想指标，因为这一粒级保留了最大的SOC/TSN存量。
An understanding of the dynamics of soil organic carbon (SOC) as affected by farming practices is imperative for maintaining soil productivity and also for restraining global warming by CO2 evolution. Results of a long-term (30 year) experiment in the Indian Himalayas under rainfed soybean (Glycine max L.)-wheat (Triticum aestivum L.) rotation was analyzed to determine the influence of mineral fertilizer and farmyard manure (FYM) application at 10 Mg ha(-1) on SOC and total soil nitrogen (TSN) stocks and distribution within different aggregate size fractions. Fertilizers (NP, NK and NPK) and FYM in combination with N or NPK were applied before the soybean crop every year and no nutrient was applied before the wheat crop. Results showed that addition of FYM with N or NPK fertilizers increased SOC and TSN contents. The overall gain in SOC in the 0- to 45-cm soil depth interval in the plots under NPK + FYM treatment over NPK was 17.18 Mg C ha(-1) in 30 year. The rate of conversion of input C to SOC was about 19% of each additional Mg C input per hectare. SOC content in large size aggregates was greater than in smaller size aggregates, and declined with decreased aggregate size. Thus, long-term soybean-wheat rotation in a sandy loam soil of the Indian Himalayas sequestered carbon and nitrogen. Soil organic C and TSN sequestration in the 0.25- to 0.1-mm size fraction is an ideal indicator of long-term C and N sequestration, since this fraction retained maximum SOC/TSN stock.