宁夏引黄灌区干湿交替过程中土壤pH 的动态变化及影响因素

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	宁夏引黄灌区干湿交替过程中土壤pH 的动态变化及影响因素
	王明 1; 张晴雯 1; 杨正礼 1; 张爱平 1; 谢晓军 2; 惠锦卓 1
刊名	核农学报
	2014
卷号	28 期号:4 页码:720-726
关键词	干湿交替土壤pH 宁夏引黄灌区
ISSN号	1000-8551
其他题名	Soil pH Changes in the Paddy Field during the Drying and Rewetting Cycles in the Ningxia Irrigation Area of the Yellow River Basin
英文摘要	地处干旱半干旱区的黄灌区干湿交替过程中引起土壤环境因素的周期性变化,从而影响农田生态系统关键过程。通过连续测定黄河上游宁夏引黄灌区稻田在灌溉淹水和落干过程中的土壤pH,研究在水稻生育期内表层土壤pH 在高频次灌溉排水干湿交替过程中的变化规律。结果表明: 在灌水之后淹水过程中,表层土壤pH 升高; 相反在淹水之后落干过程中表层土壤pH 降低; 但在最后一次灌水之后,经过长时间的落干烤田过程,土壤pH 随表层土壤表层盐分积累过程逐渐升高。土壤电导率(EC)与土壤pH 在灌溉淹水和落干过程中具有相同的变化趋势,具有显著正相关性(p < 0. 05),土壤氧化还原电位(Eh)与pH 呈极显著负线性相关(p < 0. 01),而灌溉量、施肥量、降水、地表5 cm 土壤温度对表层土壤pH 的影响均不显著。; Drying and rewetting are common events in paddy soils particularly in the irrigation area of the arid and semiarid region,where soil environment may be further affected by salinity. Through continuous measurement of soil pH in the paddy field during the drying and rewetting cycles,we studied the response of pH in the soil surface layer in paddy rice to frequent flooding and drying cycles in Ningxia Yellow River Irrigation region. The results showed that soil pH in the surface layer increased during the flooding process in the early rice growth season,while soil pH decreased during the dry process. However,soil pH increased gradually due to the surface layer soil salinization during the paddy field enduring the long time drying process during the late stage of rice growth. Soil electrical conductivity(EC)and soil pH during the drying and rewetting cycles has the same changing trend with a significant positive correlation (p < 0. 05), while soil Eh and soil pH showed a significant negative correlation (p < 0. 01). There were no significant relationship among the irrigation amount,fertilization application rate,precipitation,temperature of the surface soil and soil pH.
学科主题	农业基础科学 ; 农业工程
语种	中文
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/16932]
专题	农业环境与可持续发展研究所_生态安全研究室
作者单位	1.中国农业科学院农业环境与可持续发展研究所, 北京, 100081 2.西北农林科技大学林学院, 陕西, 杨凌, 712100
推荐引用方式 GB/T 7714	王明,张晴雯,杨正礼,等. 宁夏引黄灌区干湿交替过程中土壤pH 的动态变化及影响因素[J]. 核农学报,2014,28(4):720-726.
APA	王明,张晴雯,杨正礼,张爱平,谢晓军,&惠锦卓.(2014).宁夏引黄灌区干湿交替过程中土壤pH 的动态变化及影响因素.核农学报,28(4),720-726.
MLA	王明,et al."宁夏引黄灌区干湿交替过程中土壤pH 的动态变化及影响因素".核农学报 28.4(2014):720-726.