稻田养殖水生绿肥对水层中氮素循环的影响

NITROGEN CYCLE IN WATER LAYER OF PADDY FIELD AS AFFECTED BY THE PLANTATION OF AQUATIC PLANTS

摘要:

在我国南方水稻生产中,如何开辟新肥源以改良土壤、增产粮食是个重要课题.增辟肥源途径很多,其中探讨水稻田的养分循环,研究以田养田的技术措施是有价值的.本文拟在讨论水稻田水层的氮素循环基本特性的基础上,对水浮莲(Pistia stratiotes L.)在稻田放养和利用的技术及其效果作一介绍.

Abstract:

A review on the effect of the plantation of aquatic plants on rice yield conducted by the authors in recent years is given.It is considered that the nitrogen cycle in the water layer is closely related to the nitrogen cycle in the underlying soil layer,and the plantation of aquatic plants in rice field showed beneficial effects on the nitrogen economy for rice growth.Another aquatic plant,pistia stratiotes,although does not possess the ability of fixing nitrogen from the atmosphere,reduced the loss of nitrogen brought in through irrigation water and fertilizers,and diffused from the underlying soil.The latter effect is quite important in decreasing the loss of fertilizer nitrogen.