轮作模式下灌水量对设施连作土壤理化性状的影响

摘要

选取连作9年的日光温室，采用田间区组设计，在上茬黄瓜拉秧后至下茬水稻种植前设置不同灌水次数：1次（T1）、3次（T2）、5次（T3）和不灌水（CK）处理，研究了在稻菜轮作模式下，水稻种植前不同灌水量对设施连作土壤理化性状的影响。结果表明，在灌水2个月后，与灌水1次、灌水3次相比，灌水5次可以明显降低土壤 pH 和电导率；灌水5次的全氮、有效磷和速效钾较 CK 分别降低了11．40％、6．59％和34．80％；灌水3次和5次两个处理的土壤有效铜和有效铁均比灌水前有所增加，而对土壤有效锌并无明显影响。%In order to study the effects of different irrigation amount on the physical and chemical proper-ties of continuous cropping soil under the rice -cucumber rotation mode,with greenhouse continuous cropping for 9 years,four treatments of different irrigation times (irrigating 1 time as T1 ,3 times as T2,5 times as T3 and non -irrigation as CK)were set by field block design during the period of cucumber harvest to rice plant-ing.The results showed that after irrigating for 2 months,compared with T1 and T2,T3 treatment could sig-nificantly reduce soil pH value and electrical conductivity.Compared with CK,the total nitrogen,available phosphorus and available potassium of T3 treatment reduced by 1 1 .40%,6.59% and 34.80% respectively. The soil available Cu and available Fe of T2 and T3 treatment both increased than before irrigation,while the available Zn was not significantly affected.