红壤丘陵双季稻稻田农田生态系统不同施肥下碳汇效应及收益评估

收集江西一个红壤水稻田长期肥料试验中产量、施肥量、土壤有机碳等资料，结合对农田生产中各项生产资料和管理活动的投入进行调查，对不同施肥处理下系统的生产力、碳投入排放与碳收集效应进行分析，并估算系统的碳汇。评价了不同处理下生产力的碳成本与碳汇效益。结果表明，种植双季稻下化肥配施和化肥有机肥配施下的稻田总碳汇分别为-2．2和-3．2t C·hm^-2·a^-1，但在两季生产中并无显著差异；相应地，有机无机肥配施比纯化肥配方施肥产量提高了30％左右，而碳汇量提高了50％左右。证明有机无机配合施肥是一种可以增产增汇的关键农业生产管理途径。

Estimation of Net Carbon Balance and Benefits of Rice-rice Cropping Farm of a Red Earth Paddy Under Long Term Fertilization Experiment from Jiangxi,China

Data of crop yield, soil C stock, fertilizer application rate were collected of a longterm fertilization trial in Jiangxi red soil region. A consultant survey of agrochemical inputs, management inputs and labor input for the local production system was conducted. A analysis of productivity, C inputs and C squestration was evaluated and net C balance was estimated under different fertilization schemes. The results showed that total annual C balance of the double rice system ranged from -2.2 t C·hm^-2·a^-1 under compound chemical fertilizers and 3.2 t C·hm^-2·a^-1 under combined inorganic with organic fertilizers. The net C balance was not significantly different between the.fertilization treat- ments studied. Hpwever, annual C sink and grain productivity was enhanced respectively by up to 50% and by 30% under combined inor- ganic with organic fertilization comparted to compound chemical fertilization. It is suggesting that combined fertilziation of inorganic fertilizers with organic fertilizers would be a critical option of agricultural management practices to enchance the rice productivity and C sink effect of the rice paddy field.