黔中久安现代生态茶园不同地表残存物的持水性能研究

Study on water holding capacity of different surface residues in Jiu,an Modern Ecological Tea Plantation in Central Guizhou

以黔中久安生态茶园作为研究对象,采取野外调查和室内试验相结合的方法,对茶园中分布的5种不同林分下地表残存物的持水性能进行研究。研究表明:(1) 5种林分的地表残存物的蓄积量大小排列为马尾松林>光皮桦林>杉木林>混交林>茶林,残存物未分解层的蓄积量低于半分解层的蓄积量;(2)残存物的持水量、持水率与浸水时间均呈显著的对数相关性,残存物的持水量、持水率在前4 h的增加幅度较大,浸水4 h后增幅趋向平缓,不同林分残存物的持水量、持水率均表现为半分解层高于未分解层,而马尾松的持水量、持水率均为最高;(3)残存物的吸水速度与浸水时间呈显著指数相关性,残存物的吸水速度在前4 h有明显的变化,浸水4 h后变化趋向平缓,不同林分残存物的吸水速度表现为半分解层高于未分解层,而马尾松的吸水速度最快。

In this paper,Jiu'an Ecological Tea Plantation in Central Guizhou was taken as the research object.The combination of field investigation and laboratory test was used to study the water holding capacity of surface residues under five different kinds of forest stands distributed in the tea plantation.The results showed that:(1)the accumulation of residues of the five kinds of forest stands ranked as Pinus massoniana forest>Betula luminfera forest>Chinese fir forest>lacquer tree and Betula luminfera mixed forest>tea forest,and the accumulation of the undecomposed layer of residues was lower than that of the semi-decomposed layer;(2)the water holding capacity/water holding rate and water immersion time of the residues showed significant logarithm correlation;the water holding capacity and water holding rate increased greatly in the first 4 hours,and the growth rate tended to be gentle after 4 h immersion;the water holding capacity and water holding rate of the semi-decomposed layer of residues was higher than that of the undecomposed layer of all forest stands,while Pinus massoniana forest had the highest water holding capacity;(3)the water absorption speed of the residues was significantly correlated with the water immersion time;the water absorption speed of the residues changed significantly in the first 4 hours,and the change tended to be gentle after 4 h immersion;the water absorption speed of the semi-decomposed layer of residues was higher than that of the undecomposed layer of all forest stands,while Pinus massoniana forest had the highest water absorption rate.