Effects of wheat/faba bean intercropping on soil nitrogen transformation processes
Effects of wheat/faba bean intercropping on soil nitrogen transformation processes
复制标题
小麦/蚕豆间作对土壤氮素转化过程的影响
DOI：
10.1007/s11368-018-2164-3
复制
发表时间：
2019
影响因子：
3.6
通讯作者：
Lei Baokun
中科院分区：
文献类型：
--
作者：
Xu Yongbo;Qiu Weiwen;Sun Jianping;Mueller Christoph;Lei Baokun
目的间作可以提高作物产量，维持土壤有机质水平。潜在的机制与地上和地下养分有关（例如，氮的有效性、吸收和利用效率。本研究的目的是确定小麦/蚕豆间作对氮素有效性的提高对产量的影响，并探讨小麦/蚕豆间作根际土壤氮素转化速率，与单一作物相比。测定了间作和单作小麦根际土壤的作物生产力，以蚕豆为试材，采用氮-15（15 N）培养法研究了间作对土壤总氮转化率的影响。间作蚕豆和小麦的籽粒产量分别比单作高11.4%和34.2%。间作系统的有机氮矿化和硝化的总速率和净速率以及总的无机氮固定速率均显著高于单作系统。结果表明，小麦/蚕豆间作能显著提高小麦/蚕豆间作的土壤氮素供应和保持能力，并能提高土壤的矿化-固定周转率（MIT），提高矿质氮的有效性。单作条件下NO3-淋溶和径流的环境影响可以通过间作管理来缓解。
PurposeIntercropping can increase crop production and maintain soil organic matter levels in soil. The underlying mechanisms are associated with above- and below-ground nutrient (e.g., nitrogen) availability, uptake, and use efficiency. The aims of this study were to identify the effect of the N availability improvement on yield of intercrops and to explore soil N transformation rates in rhizosphere soil of wheat/faba bean intercrops, as compared with their sole crops.Materials and methodsIn a field experiment, crops productivity was measured and rhizosphere soils of intercropped and monocropped wheat/faba bean were collected to examine changes of soil gross N transformation rates via a nitrogen-15 (15N) incubation study.Results and discussionIntercropping significantly increased the productivity. Grain yields of intercropped faba bean and wheat were 11.4 and 34.2% higher than those of the corresponding monocrops, respectively. The gross and net rates of organic N mineralization and nitrification, as well as the gross mineral N immobilization rates were considerably greater in intercropping compared to the sole cropping system. The results suggested that the increased grain yield during intercropping was related to an improved capacity of N supply and conservation in soils via an intensification of the mineralization-immobilization turnover (MIT) and intercropping enhanced mineral N availability.ConclusionsOur findings demonstrated that wheat/faba bean intercropping was able to significantly increase the productivity of both companion crops under subtropical condition. The environmental implication of NO3−leaching and runoff under monocropping conditions could be alleviated by adopting an intercropping management.