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机构地区:[1]西南林业大学环境科学与工程学院水土保持与荒漠化防治重点学科,云南昆明650224 [2]西北农林科技大学水土保持研究所,陕西杨陵712100
出 处:《浙江大学学报(农业与生命科学版)》2012年第2期204-210,共7页Journal of Zhejiang University:Agriculture and Life Sciences
基 金:国家重点基础研究发展计划“973”资助项目(2009CB118604);国家科技支撑计划重大资助项目(2011BAD31B01);中国科学院知识创新工程重要方向资助项目(KZCX2-YW-424-3);中国科学院知识创新工程重大资助项目(KSCX-YW-09-07)
摘 要:为了解不同种植体系对土壤交换性镁的影响,从陕西省长武县黄土高原长期定位试验站采集6个种植体系[小麦连作、豌豆-小麦(2a)+糜子轮作、红豆草-小麦(2a)轮作、豌豆-小麦(2a)+玉米轮作、玉米-小麦(2a)+糜子轮作、小麦(2a)+糜子-玉米轮作]的0~200cm土壤剖面样品,研究22年连续施用氮磷(NP)化肥下6个种植体系交换性镁在土壤剖面上的分布与累积状况。结果表明:不同种植体系交换性镁在土壤剖面上发生淋溶累积现象,在60~100cm土层产生累积峰;交换性镁的累积峰值由高至低分别为:红豆草-小麦(2a)轮作263mg.kg-1、小麦(2a)+糜子-玉米轮作255mg.kg-1、玉米-小麦(2a)+糜子轮作250mg.kg-1、豌豆-小麦(2a)+糜子轮作248mg.kg-1、小麦连作244mg.kg-1、豌豆-小麦(2a)+玉米轮作243mg.kg-1;不同种植体系0~200cm土壤交换性镁的总累积量由高至低分别为:红豆草-小麦(2a)轮作6 152kg.hm-2、小麦(2a)+糜子-玉米轮作5 855kg.hm-2、豌豆-小麦(2a)+糜子轮作5 853kg.hm-2、玉米-小麦(2a)+糜子轮作5 755kg.hm-2、豌豆-小麦(2a)+玉米轮作5 740kg.hm-2、小麦连作5 347kg.hm-2。不同种植体系交换性镁在土壤剖面上分布与累积差异的原因主要是由作物和种植方式的不同引起的。To understand the effects of different cropping systems on soil exchangeable Mg, samples of soil profiles under six types of different cropping systems were collected from long-term location experiment station, Changwu County, Shaanxi Province. The changing conditions of exchangeable Mg in soil profiles of different cropping systems under the condition of 22 years' continuous application of NP chemical fertilizer in Loess Plateau were studied. The results showed that the exchangeable Mg occurred eluviation and accumulation in soil profiles of different cropping systems. The peak was at 60-100 cm soil depth with the values of 263, 255, 250, 248, 244 and 243 mg. kg^-1 under the sainfoin-wheat (2 a) rotation, wheat (2 a) + millet-maize rotation, maize-wheat (2 a) + millet rotation, pea-wheat (2 a) + millet rotation, wheat succession and pea-wheat (2 a) +maize rotation systems, respectively. The cumulative amounts of exchangeable Mg in soil profiles (0-200 cm) under the sainfoin-wheat (2 a) rotation, wheat (2 a) + millet-maize rotation, pea-wheat (2 a) + millet rotation, maize-wheat (2 a) + millet rotation, pea-wheat (2 a) + maize rotation and wheat succession were 6 152, 5 855, 5 853, 5 755, 5 740 and 5 347 kg. hm^-2, respectively. The results suggest that the different crops and cropping systems have effects on difference of exchangeable Mg distribution and accumulation in soil profile.
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