岩溶区不同根系生境白栎的细根分解  

Fine root decomposition of the different root in underground habitats in Karst area

作　　者：符裕红[1,2] 喻理飞[1] 黄宗胜[1] 

机构地区：[1]贵州大学,贵阳550025 [2]贵州师范学院

出　　处：《林业科技开发》2015年第5期27-31,共5页China Forestry Science and Technology

基　　金："211工程"三期重点学科建设项目(Kst200904);国家"十二五"科技支撑项目(2011BAC09B01;2011BAC02B02);贵州省自然科学基金项目(黔合科J字[2013]2236号);贵州师范学院自然科学研究基金项目(12BS029);贵州省科技计划项目(黔科合SY字[2012]3012号)

摘　　要：选取3种典型根系地下生境——白云岩低倾产状生境(类型6)、中倾产状生境(类型9)及高倾产状生境(类型11)中生长的优势树种白栎为对象,研究其细根在不同条件下的分解状况及变化。结果表明:细根质量损失率、残留率、分解速率均表现为低倾产状生境>中倾产状生境>高倾产状生境;细根分解时间的快慢为低倾产状生境>中倾产状生境>高倾产状生境;细根养分含量变化存在差异,但均呈现"降低—升高—降低"的趋势;细根分解50%时,N、P、K的净释放率均表现为中倾产状生境>高倾产状生境>低倾产状生境。该研究可为探索岩溶区根系地下生境及植被恢复技术等提供参考。The author chosed the species Quercus fabric as the test subject in the habitats of dolomite low oblique occurrence （ type 6 ）, middle oblique occurrence （ type 9） and high oblique occurrence （ type 11 ）. After studying the fine root decom- position under different conditions, the results showed that fine root mass loss rate, residual rate and decomposition rate were as follows ： low oblique occurrence habitat 〉 middle oblique occurrence habitat 〉 high oblique occurrence habitat. The decomposition speed was low oblique occurrence habitat 〉 middle oblique occurrence habitat 〉 high oblique occurrence habi- tat. There were differences in changes of nutrient content, but all showed a ＂decrease - increase - decrease＂ trend. When 50% of fine root was decomposed, net release rate of N, P and K were as follows ： middle oblique occurrence habitat 〉 high oblique occurrence habitat 〉 low oblique occurrence habitat. This research could provide references for the exploration of the underground habitats and vegetation recovery technology in Karst area.

关 键 词：白栎 细根分解 根系地下生境 岩溶区 

分 类 号：S153.621[农业科学—土壤学]