长江下游稻麦轮作农田不同施肥措施的固碳潜力分析

基于长江下游稻麦轮作农田27个长期试验点184组样本数据，采用Meta分析法研究无机氮肥（N）、无机氮磷钾肥配施（NPK）、单施有机肥（O）和有机无机肥配施（OF）4种施肥措施下农田土壤有机碳含量相对年变化量、固碳持续时间以及在固碳周期内的固碳比例。结果表明，N、NPK、O和OF处理均能增加农田表土有机碳含量相对年变化量，分别为0.05、0.19、0.22和0.31 g·kg-1·a-1，其中，以OF等处理下为最大。两熟制和三熟制农田表土有机碳含量相对年变化量分别为0.26和0.21 g·kg-1·a-1；随着监测时间的延长，N、NPK、O和OF等4种处理下农田表土有机碳增加速率逐渐降低，农田土壤固碳持续时间分别达19、36、51和47 a，以O处理最长。整个固碳周期内土壤所能增加的有机碳比例分别为6.93%、18.98%、22.34%和32.33%，以OF处理下为最高。从农田土壤固碳角度考虑，有机无机肥配施为长江下游稻麦轮作农田较为适宜的施肥方式。

Analysis into soil organic carbon sequestration potential of different fertilization modes under rice wheat rotation in lower Yangtze River

Based on 184 samples taken from 27 paddy field experimental sites in the rice wheat rotation fields in lower Yangtze River， a Meta analysis was performed to quantify the relative annual changes of soil organic carbon （SOC） content （RAC） and SOC sequestration duration in paddy fields under 4 fertilization modes （inorganic nitrogen fertilization， N; inorganic nitrogen， phosphorus， and potassium fertilization， NPK; organic fertilization， O; and inorganic combined with organic fertilization， OF）. It was shown that all fertilization treatments could significantly increase RAC in paddy fields， and the RAC under N， NPK， O and OF was 0.05， 0.19， 0.22 and 031 g·kg-1·a-1， respectively， and the highest RAC was recorded under OF treatment. RAC in topsoil under double cropping system and triple cropping system was 0.26, 0.21 g·kg-1·a-1， respectively. The topsoil organic carbon accumulation rate decreased gradually with increasing time under all 4 fertilization modes. The soil organic carbon sequestration duration of N， NPK， O and OF was 19， 36， 51 and 47 a， respectively， and it was the longest under O treatment. Accumulation enhancement rates of SOC for N， NPK， O and OF over the whole soil organic carbon sequestration period were 6.93%， 18.98%， 22.34% and 32.33%， respectively， and it was the largest under OF treatment. From the perspective of soil carbon sequestration in cropland， fertilization treatments with inorganic combined with organic fertilization was more appropriate for rice wheat rotation in the lower Yangtze River.