高黎贡山南段4种典型植被类型枯落物层持水性能研究

Study on Water Holding Capacity of Litter of Four Typical Vegetation Types in South Section of Gaoligongshan Mountain

采用野外测定与室内实验分析相结合的方法,对高黎贡山南段4种典型植被类型枯落物层持水性能进行对比研究。研究结果表明,(1)枯落物总厚度为天然阔叶林>旱冬瓜林>杉木人工林>次生阔叶林,其中未分解层枯落物厚度为旱冬瓜林>天然阔叶林>杉木人工林>次生阔叶林,半分解层枯落物厚度为天然阔叶林>杉木人工林>旱冬瓜林>次生阔叶林;枯落物总贮量为天然阔叶林>次生阔叶林>旱冬瓜林>杉木人工林,其中未分解层枯落物贮量为次生阔叶林>天然阔叶林>杉木人工林>旱冬瓜林,半分解层枯落物贮量为天然阔叶林>旱冬瓜林>次生阔叶林>杉木人工林;(2)未分解层及半分解层最大持水量均为天然阔叶林>杉木人工林>旱冬瓜林>次生阔叶林;(3)未分解层及半分解层持水速度均为天然阔叶林>杉木人工林>旱冬瓜林>次生阔叶林。因此,4种植被类型枯落物层持水性能以天然阔叶林为最好。

Abstract： The water holding capacities of litters of four typical vegetations in south section of Gaoligongshan moun- tain were studied through field determination, indoor experiments and analysis. The study results were as follows： 1 ） The thickness of litter was in the order of natural broadleaved forest 〉 Alnus nepalensis forest 〉 Cunninghamia lanceolata plantation 〉 secondary broadleaved forest; among which, the thickness of undecomposed litter was in the order of Alnus nepalensis forest 〉 natural broadleaved forest 〉 Cunninghamia lanceolata plantation 〉 seconda- ry broadleaved forest ; the thickness of semi-decomposed litter was in the order of natural broadleaved forest 〉 Cun- ninghamia lanceolata plantation 〉 Alnus nepalensis forest 〉 secondary broadleaved forest. The total storage of lit- ter was in the order of natural broadleaved forest 〉 secondary broadleaved forest 〉 Alnus nepalensis forest 〉 Cun- ninghamia lanceolata plantation, among which, the storage of undecomposed litter was in the order of secondarybroadleaved forest 〉 natural broadleaved forest 〉 Cunninghamia lanceolata plantation 〉 Alnus nepalensis forest, the storage of semi-decomposed litter was in the order of natural broadleaved forest 〉 Alnus nepalensis forest 〉 sec- ondary broadleaved forest 〉 Cunninghamia lanceolata plantation. 2） The maximum water holding capacity of un- decomposed litter and semi-decomposed litter was in the order of natural broadleaved forest 〉 Cunninghamia lan- ceolata plantation 〉 Alnus nepalensis forest 〉 secondary broadleaved forest. 3） The speed of water holding of un- decomposed litter and semi - decomposed litter was in the order of natural broadleaved forest 〉 Cunninghamia lan- ceolata plantation 〉 Alnus nepalensis forest 〉 secondary broadleaved forest. In conclusion, the water holding ca- pacity of natural broadleaved forest was the best among these four vegetations.