摘要
为了研究柽柳对盐碱土的生物改良作用及其有效作用范围,通过大田对比试验,以盐碱荒地为对照,分析了柽柳对土壤养分、全盐及盐分离子的影响及其区化特征。结果表明,柽柳能够提高盐碱地土壤养分,降低pH值、全盐及盐分离子含量。与对照相比,表层0—20cm土壤有机质增加了30.5%,碱解氮增加了48.9%,速效磷增加了51.4%;底层20—50cm土壤3者分别增加了78.8%,21.3%,25.0%;表层土壤pH值降低0.3个单位,但是底层20—50cm土壤pH值增加了0.4个单位;表层和底层脱盐率分别达到86.4%和88.2%,碱化度分别降低了75.4%和53.8%;柽柳对土壤盐分离子表现出选择吸收性,Na+和Cl-降幅高于Ca2+,Mg2+,K+,SO24-。柽柳在深度0—25cm,距离树干0—15cm范围内,形成"低盐、低pH值、高有机质"的优化区域。确定合理的柽柳配置方案,充分发挥其生物和非生物功能,是土壤理化性质向良性循环方向发展的关键。
In order to study phytoremediation of Tamarix ramosissima on saline-alkali soil and its effective range.Total salt and ionic contents of saline-alkali soils and characteristics of nutrient partition were analyzed based on field comparative test with saline-uncultivated land as CK.The results show that Tamarix increased nutrient contents of the saline-alkali soils,but decreased pH,total salt and ionic contents.Compared with CK,soil organic matter（SOM）,available N,and available P at surface（0—20 cm） increased 30.5%,49.8% and 51.4%,respectively,and at sub-layer（20—50 cm） increased 78.8%,21.3% and 25.0%,respectively.The pH value was 0.3 units lower than CK at surface layer（0—20 cm）,but was 0.4 units higher at sub-layers（20—50 cm）.The desalination rate at surface layer and sub-layer were 86.4% and 88.2%,respectively,while ESP decreased 75.4% and 53.8%,respectively.Meanwhile,Tamarix exhibited selective absorption for Na＋ and Cl-,with a significant higher reduction amplitude than other ions,such as Ca2＋,Mg2＋,K＋ and SO2-4.An optimizing region with ＂lower total salt,lower pH and higher SOM＂ was formed in a layer of 0—25 cm depth within 15 cm to Tamarix.An reasonable Tamarix arrangement that could fully realize its biological and non-biological functions will be the key to improve physical and chemical properties of saline-alkali soils for sustainable development.
出处
《水土保持通报》
CSCD
北大核心
2011年第2期73-76,共4页
Bulletin of Soil and Water Conservation
基金
国家科技支撑课题"河套地区耐盐植物筛选及应用示范研究"(2007BAC08B04)
宁夏回族自治区自然科学基金(NZ0972)
关键词
柽柳
盐碱土
全盐含量
区化特征
Tamarix ramosissima
saline-alkali soil
soil total salt
characteristics of partition
