摘要
为研究节水灌溉条件下灌区稻田土壤肥力分布规律,以我国南方水稻节水灌区湖北省漳河灌区的稻田土壤为研究对象,分a层0～25cm、b层25～50cm两个取样深度钻取土样,并进行肥力指标的分析。结果表明:各向同性条件下,a层的速效钾、pH值相关性弱,其余的属中等相关,b层四个指标均属中等相关;各向异性条件下,各指标的系统内的总变异有明显加强,系统变量的空间相关性属中等强度。克立格法插值图表明,a层的碱解氮、速效磷含量明显高于b层,且比b层分布均一,随着深度的增加,含量有所降低;a层碱解氮、速效磷在系统内的总变异性大于b层,但pH值没有明显的变化。本研究可以为探索节水灌溉技术与优化施肥技术相结合,促进节水、减污、增产提供参考。
In order to study the laws of fertility distribution of paddy field in rice-based irrigation district basing the water saving,take the Zhanghe Irrigation Area in Hubei Province, which is the water saving flee-based irrigation area in South China as an example, soil samples in the 0-25cm and 25- 50cm were drilled, and fertility indicators were analyzed. The results showed that in the condition of isotropy, rapidly-available potassium and potential of hydrogen＇s correlation were weak, and the rest were the middle correlation in a layer, the four indicators were the middle correlation in b layer. In the condition of anisotropy, the indicator＇s total spatial variability in the system were obviously strengthen. system variables＇ spatial correlation were the moderate. Krging interpolation maps indicated that the content of alkali-hydro nitrogen and rapidly-available phosphorus in a layer was more than b layer, and more uniform than b. With the depth increasing, the content is reducing, alkali-hydro nitrogen and rapidly-available＇s total variability in the system was a layer more than b layer, but potential of hydrogen has not significant change. The study can provide the exploration of combination that water saving irrigation technology and optimum fertilization technology, also to promote water conservation, pollution reduction, increase production.
出处
《广西农学报》
2012年第3期5-11,共7页
Journal of Guangxi Agriculture
基金
国家自然科学基金项目(50839002)
广西高校科研资助项目(200103YB184)
广西水利科技项目(NO.201020)
关键词
水稻灌区
土壤肥力
空间变异
半方差
Rice-based Irrigation District
soil fertility
spatial variability
semi-variance
