摘要
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。
Based on 184 samples taken from 27 paddy field experimental sites in the rice-wheat rotation fields in low-er 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 nitro-gen 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 accumula-tion rate decreased gradually with increasing time under all 4 fertilization modes .The soil organic carbon sequestra-tion duration of N, NPK, O and OF was 19, 36, 51 and 47 a, respectively, and it was the longest under O treat-ment.Accumulation enhancement rates of SOC for N , NPK, O and OF over the whole soil organic carbon sequestra-tion 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.
出处
《浙江农业学报》
CSCD
北大核心
2016年第7期1249-1261,共13页
Acta Agriculturae Zhejiangensis
基金
江苏高校哲学社会科学研究项目(2015SJD087)
教育部人文社会科学研究青年基金(15YJCZH246)
中国博士后科学基金(2015M570463)
南京农业大学中央高校基本科研业务费人文社科基金(SKCX2014001
SKPT2015028)
关键词
稻麦轮作
施肥
土壤固碳
META分析
rice-wheat rotation
fertilization
carbon sequestration
Meta-analysis
