Hydrological Effects of Litter and Soils in Nine Forest Types of the Jieba Region
A pilot study of hydrological effects of litter and soil layer was carried out in nine forest types in Bayingzhuang forest farm.The results showed:(1) the total storage capacity of litter was about 5.79～24.97 t/hm2,which decreased in the order:Betula platyphylla Suk.pure forest＞Betula platyphylla Suk.-Populus davidiana mixed forest＞ Pinus tabuli formis pure forest＞ Populus davidiana pure forest＞Quercus mongolica pure forest ＞ Larix principis rupprechti-Pinus tabuliforrnis mixed forest ＞ Betula platyphylla Suk.-Betula davurica mixed forest＞Larix principis rupprechti pure forest＞Larix principis rupprechti-Betula platyphylla Suk.mixed forest;(2) there were some differences in water holding capacities of litter in 9 forest types,which decreased in the order of Betula platyphylla Suk.-Populus davidiana mixed forest＞ Populus davidiana pure forest＞ Pinus tabuli formis pure fores＞ Betula platyphylla Suk.pure forest＞ Betula platyphylla Suk.-Betula davurica mixed forest＞ Larix principis rupprechti-Pinus tabuli formis mixed fores＞Quercus mongolica pure forest＞Larix principis rupprechti-Betula platyphylla Suk.mixed forest＞Larix principis rupprechti pure forest;(3) water holding capacity and soaking time had the significant logarithmic relationship,the correlation coefficient was above 0.95;the relationship between absorption rate and soaking time could be described by power function,the correlation coefficient was greater than 0.90;(4) the modified interception amount of Quercus mongolica pure forest was the strongest,which was 52.63 t/hm2;the modified interception amount of Larix principis rupprechti-Betula platyphylla Suk.mixed forest was the least,which was 14 t/hm2;(5) water holding capacity of soil in Quercus mongolica pure forest was strongest,which was 117.42 t/hm2,water holding capacity of soil in Betula platyphylla Suk.-Populus davidiana mixed forest came the next,which was 104.75 t/hm2,water holding capacity of soil in Betula platyphylla Suk.pure forest was the least,which was 37.80 t/hm2;(6) the soil initial infiltration rate was about 2.3 ～ 56.8 mm/min;The relationship between the infiltration rate and infiltration time could be fitted by power function,the correlation coefficient was greater than 0.95.
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