红壤幼龄桔园套种豆科牧草后土壤酸度变化特征.pdf

2017,36(2):308-313
农业环境科学学报
2017年2月
*s Journal of Agro-environment Science
蔡泽江,徐明岗,张璐,等红壤幼龄桔园套种豆科牧草后土壤酸度变化特征卟农业环境科学学报,2017,36(2):308-313.
CAI Ze-jiang, XU Ming-gang, ZHANG Lu, ct al. Change of red soil acidity from legume cultivation in a young citrus orchard J l. ournal of Agro-ewironment
Science,2017,36(2):308-313
红壤幼龄桔园套种豆科牧草后土壤酸度变化特征
蔡泽江2,徐明岗,张路2,王伯仁2,文石林2,中华平12
(1.中国农业科学院农业资源与农业区划研究所,耕地培育技术国家工程实验室,北京10006;2.中国农业科学院衡阳红壤实验
站,祁阳农田生态系统国家野外试验站,湖南祁阳426182)
摘要:基于2010-2011年开展的幼桔园套种豆科牧草对土壤酸度影响试验,以当地常规管理模式为对照,分析了种植圆叶决
明和罗顿豆对土壤pH交换性酸、铝的影响,及其与土壊养分含量的关系,并结合室内培养试验分析豆科牧草影响红壤酸度的主要
因素。结果表明,与试验之初相比,套种圆叶决明处理0-20cm土壤pH升高了0.19个单位,而罗顿豆处理土壤pH无显著变化。与
常规模式相比,套种圆叶决明处理0-20cm和20-40cm上壤pH分别升高了0.26个和0.39个单位,而0-20cm土壤交换性酸、铝
含量分別降低了1.25cmol(+)-kg2和1.35cmol(+)-kg-1,20-40cm土壤交换性酸、铝均降低了107cml(+),kg。土壤交换性铝含
量与土壤全氮呈显著负相关(P005),而土壤全氮与上壤有机质和有效磷均呈极显著正相关(P<0.01)。室内培养试验表明,豆科牧
草的灰化碱含量和还田量是影响其改良红壤酸度的两个主要因素。可见,在酸性红壤上套种圆叶决明和罗顿豆木加剧表层(0~40
cm)土壤酸化,相反套种圆叶决明对红壤酸度具有一定的缓解效果。
关键词:红壤酸化;pH;交换性酸;圆叶决明;罗顿豆
中图分类号:X53文献标志码:A文章编号:1672-2043(2017)02-0308-06doi:10.11654jaes2016-0829
Change of red soil acidity from legume cultivation in a young citrus orchard
CAL Ze-jiang XU Ming-gang ', ZHANG Lu WANG Bo-ren WEN Shi-lin, SHEN Hua-ping
(1 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, National Enginccring Laboratory for
Improving Quality of Arable Land, Beijing 100081, China; 2. Hengyang Red Soil Experimental Station, Chinese Academy of Agricultural Sci-
ences, Qiyang Agro-ecosystem of National Field Experimental Station, Qiyang 426182, China
Abstract: The objective of this study was to investigate the effects of two common legumes(Chamaecrista rotundifolia and Lotononis bainesii
on the acidification of red soil compared with conventional management. A field experiment(2010-2011)and an incubation experiment
were conducted and changes in soil PH, exchangeable acidity, and exchangeable aluminum, as well as their relationships with soil nutrient
concentrations were determined. Aer two-year planting, Chamaecrista round olia significantly increased soil pll by 0.19 units at the 0-20
cm depth compared with initial soil PH, but no significant change for Lotononis baines treatment As compared with the control, soil PH in
creased by 0. 26 and 0.39 units for 0-20cm and 20-40 m depths, respectively, in Chmecrst rotundifolia treatment; Chamaecrista rotu-
dyolia significantly decreased soil exchangeable acidity and exchangeable aluminum at the 0-20 cm depth by 1.25cmol(+).kg"l and 1.35
cmol (+)kg, respectively, and at the 20-40 m depth by 1. 07 cmol(+).kg for both parameters. Soil exchangeable aluminum was nega
tively correlated with soil total nitrogen, while soil total nitrogen was positively correlated with soil organic matter and available phosphorus
Incubation experiment showed that ash alkalinity content and application rates determined the effects of legumes on soil acidity. Results in
dicated that the cultivation of legumes in orchard did not accelerate acidification of soil at the 0-40 cm depth, and some legume species such
as Chamaecrista rotundifolia could ameliorate the acidification of the red soil
Keywords: red soil acidification; PH; exchangeable acidity; Chamaecrista rotundifolia: Lotononis bainesii
收稿日期:2016-06-20
作者简介:察泽江(1982-),男,河北迁西人,硕士,助