农田管理措施对滨海盐渍化土壤碳平衡的影响

发布时间：2018-07-21 13:05

【摘要】：为研究不同农田管理措施对滨海盐渍土壤碳平衡的影响,通过玉米-小麦轮作试验,研究农田土壤碳收支情况。试验共设6个处理:(1)常规对照(CK),(2)有机肥常量(OF),(3)氮肥增施(NF),(4)秸秆还田(S),(5)有机肥加秸秆(OF+S),(6)免耕(NT)。结果表明,秸秆还田和施用有机肥提高了土壤呼吸的强度,而NT处理的CO_2平均释放量最低,不同处理下土壤呼吸表现为OF+S处理S处理OM处理NF处理CKNT处理。各处理土壤有机碳量随着作物种植年份的增加而逐渐升高,其中OF与NT处理增加最多,而NF处理并没有显著提高土壤的有机碳量。在两季作物收获后,各处理的碳输入均高于碳输出,表现为碳净输入,呈现较强的碳汇特征。S处理和OF处理的碳净输入均显著高于CK,可有效减缓土壤CO_2排放,增加其有机碳的输入。
[Abstract]:In order to study the effects of different farmland management measures on the carbon balance of coastal saline soil, the carbon budget of farmland soil was studied through maize wheat rotation experiment. 6 treatments were set up: (1) conventional control (CK), (2) organic manure constant (OF), (3) nitrogen fertilizer application (NF), (4) straw returning (S), (5) organic fertilizer and straw (OF+S), (6) no tillage (NT). The results showed that Soil respiration was enhanced by straw returning and application of organic manure, while the average release of CO_2 treated by NT was the lowest. Soil respiration under different treatments was OF+S treatment S treatment OM treatment NF treatment CKNT treatment. The soil organic carbon content increased gradually with the increase of crop planting year, and OF and NT treatment increased most, and NF. In the two season, the carbon input of each treatment was higher than that of carbon output after two season crop harvest. The carbon net input showed a strong carbon sink characteristic, and the carbon net input of.S treatment and OF treatment was significantly higher than that of CK, which could effectively slow down the soil CO_2 emission and increase the input of organic carbon.
【作者单位】：土壤与农业可持续发展国家重点实验室中国科学院南京土壤研究所;
【基金】：国家自然科学基金项目(41171181)
【分类号】：S156.42

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