苏北杨树人工林连栽林地土壤氮素矿质化原位研究  

In situ study on soil nitrogen mineralization in successive rotation stands of poplar plantation in north Jiangsu province

作　　者：王良桂[1] 张焕朝[2] 朱强根[2] 蒋永丰[2] 颜开义 王福好 

机构地区：[1]南京林业大学风景园林学院,江苏南京210037 [2]南京林业大学森林资源与环境学院,江苏南京210037 [3]泗洪县陈圩林场,江苏泗洪223900

出　　处：《南京林业大学学报（自然科学版）》2009年第6期69-73,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金资助项目(30872015);教育部博士学科点基金资助项目(200802980002);国家"十一五"科技支撑计划(2006BAD03A15)

摘　　要：采用土柱离子交换包法,研究了苏北地区不同连栽代次杨树人工林土壤氮矿化的状况及耕作措施对二代杨树林土壤氮矿化的影响。结果表明:不同代次的杨树人工林土壤氨化速率的季节变化较为一致,二代林土壤的氨化速率和一代林相比,并未出现明显的降低,有的月份(4、7月)甚至高于一代林。二代林的硝化速率和净氮矿化速率明显低于一代林,尤其是在3、4、5月份。耕作措施虽然增加了二代林土壤氮素年氨化量、硝化量和矿化量,但由于也相应地增加了年淋溶量(约占年矿化量的49.15%),因此土壤中的无机氮含量反而低于免耕处理。By the method of in situ soil core-ion exchange resin bag （ISC-IERB） , the characteristics of soil nitrogen min- eralization in the different successive rotation stands of poplar plantation （the first rotation of four-year-old and the second rotation of four-year-old） and the effects of tillage on the soil nitrogen mineralization in the second rotation of four-year-old poplar plantation were studied in north Jiangsu province. The results showed that the seasonal changes of soil ammonifica- tion rate in two rotation stands were similar. The soil ammonification rate in the second rotation stand was not obviously de- creased and even increased in April and July, compared with the first rotation stand. However, the soil nitrification rate and net mineralization rate in the second rotation stand were significantly lower than that in the first rotation stand, espe- cially in March, April and May. Compared with the no-tillage, the annual ammonified, nitrified and mineralized nitrogen of soil in the second rotation stand treated with the tillage were increased. Meanwhile, the tillage treatment was obviously increased the soil N lose by leaching which accounted for 49.15% of the total annual mineralized N, therefore soil inorganic N content was lower in the stand treated with tillage than that in the stand with no-tillage.

关 键 词：杨树人工林 连栽代次 土壤氮素矿质化 原位 

分 类 号：S714[农业科学—林学]