摘要
通过测试分析凉州区建棚年限5~14年的日光温室土壤养分、理化性质及重金属残留现状,并将各项指标与露地大田相比较,总体表现是建棚年限在5年以上的日光温室土壤养分明显增加,土壤有机质、全氮、全磷、碱解氮、有效磷、速效钾均表现明显的累积,分别比露地农田高出3.18 g kg-1,0.48 g kg,8.73 mg kg-1,98.38 mg kg-1,45.83 mg kg-1和230.88 mg kg-1;土壤微量元素也比露地大田明显增加,同时土壤盐分及重金属砷、汞的残留也呈现明显的累积趋势,但尚未超出阻碍作物生长的指标范围。
Liangzhou District in Hexi Corridor in Gansu is one part of the Green Agricultural Demonstration Zone that was firstly found in Arid Region of Northwest China in April of 2006.This study is based on the idea of green agriculture.The soil nutrients＇ and heavy metals＇ contents and physico-chemical properties in the greenhouse were investigated,and the comparisons of the above measurements between the greenhouse and open fields were also conducted.The results showed that the greenhouse of soil organic matter,total N,total P,hydrolytic N,available P and available K were higher than those in the open fields,with the increase of 3.18 g kg-1,0.48 g kg-1,8.73 mg kg-1,98.38 mg kg-1,45.83 mg kg-1 and 230.88 mg kg-1,respectively.The contents of soil trace elements in greenhouse were also higher than those of the open fields except for B and Mn.The older the greenhouse,the higher the content of available P,available K were investigated.The electric conductivity（EC） in greenhouses was about four times as high as that in the open fields.The contents of soil heavy metals such as As and Hg in the greenhouse were higher than those in the open fields.However,the values of soil EC and heavy metals＇ contents in the greenhouse soil did not reach the harmful level to inhibit the crop growth in the study region.
出处
《土壤通报》
CAS
CSCD
北大核心
2010年第5期1165-1169,共5页
Chinese Journal of Soil Science
基金
财政部国家社会公益项目绿色农业科学研究示范项目(2007-04)
暨国家科技支撑项目"高原夏菜高效安全生产及保鲜加工关键技术研究与示范"资助
关键词
河西走廊
日光温室蔬菜
建棚年限
土壤养分
重金属
Hexi Corridor
Sunlight greenhouse vegetable
Building-up ages of the greenhouse
Soil nutrient
Heavy metals
