云南泸水5种生态公益林凋落物持水性研究

用浸水法对怒江州泸水县5种不同类型公益林凋落物的持水量、持水率和吸水速率进行研究。结果表明：5种类型公益林的凋落物储量、持水量、持水率和吸水速率均有差异，在0．5—8．0h范围，持水量和持水率随浸泡时间的延长而迅速增加；在8～12h范围，随浸泡时间的增加则缓慢增加；12h后，凋落物持水量基本达到饱和，持水量和持水率基本不随浸泡时间的增加而明显变化。与之不同的是，凋落物吸水率在0．5～8．0h范围随浸泡时间的延长急剧下降，此后缓慢下降。5种类型公益林凋落物持水量（WH）和浸泡时间（t）的关系按照对数方程变化，持水率（WR）与浸泡时间（f）可以用对数方程模拟，吸水速率（WA）与浸泡时间（t）的关系按照幂函数变化。

Water Holding Characteristics of Litters from Five Types of Public Welfare Forest in Lushui County

The water holding capacity, water holding ratio and water absorption rate of the litters sampled from five types of public welfare forests in Lushui County, Nujiang Prefecture, Yunnan Province were studied through water immersing method to study the water conservation property of the forest types. The results showed that the lit- ter amount accumulated, water holding capacity, water holding ratio and water absorption rate of the litters were different in five types of public welfare forests. Both of the water holding capacity and water holding ratio increased hastily with prolonging the immersing time within 0.5 - 8.0 h. These two index values increased slowly when the litters were immersed within 8 - 12 h, and they did not change significantly after 12 h immersion for the water hold- ing capacity of the litters all reached saturated. On the contrary, the water absorption rate of the litters from five types of public welfare forests decreased quickly with prolonging the immersing time duration within O. 5 - 8.0 h, and then decreased slowly after 8 h of immersion. The relationship between water holding capacity （ WH ） of the lit- ters from the five types of public welfare forests and the immersion time （t） could be expressed by logarithmic e- quation. The relationship between water holding ratio （ Wa ） and the immersion time （t） could be modeled by loga- rithmic equation. The relationship between the water absorption rate （ WA ） and the immersion time （t） could be expressed by power equation.