The Effect Of Close-to-nature Management Of Water Conservation Capacity Of Forest Farm In Wangyedian

This study was conducted in the field of Wangyedian Foresrt Farm,Chifeng City.Inner Mongolia.The water conservation capacity of litter layer and soil layer at the Pinus tabulaeformis forest.the Larix principis-rupprechtii forest and the Betula platyphylla forest in different ages under different forest managements were studied,the influence of close-to-nature management on soil and litter water conservation ability was analyzed.The results are as follows:(1)The litter volume of under the close-to-nature management was only higher than that under general management,but lower than that under no management.The average litter volume at Pinus tabulaeformis forest under no management,the close-to-nature management and general management was 14.37 t/hm2,12.76 t/hm2,10.97 t/hm2 respectively,and the Larix principis-rupprechtii forest was 13.48 t/hm2,11.62 t/hm2,10.36 tlim2 respectively.The Betula platyphylla forest were 12.28 t/hm2,9.68 t/hm2,7.86 t/hm2.(2)The effective water storage of litter under different forest management modes showed the same trend.The average effective water storage of litter at Pinus tabulaeformis forest under under no management,the close-to-nature management and general management was 19.54 t/hm2,16.88 t/hm2,13.42 t/hm2 respectively,and the Larix principis-rupprechtii forest was 23.54 t/hm2,17.99 t/hm,14.70 t/hm2 respectively.The Betula platyphylla forest were 22.36 t/hm2.16.27 t/hm2,13.00t/hm2.(3)The close-to-nature management improved the soil capillary porosity,and the soil capillary porosity of the three types of forest types showed a trend of close-to-nature management>no management>general management.The average soil capillary porosity at Pinus labulaeformis forest under the close-to-nature management,no management and general management was 46.14%.39.51%and 36.96%respectively,and the Lcarix principis-rupprechtii forest was 43.81%.42.20%and 40.58%respectively.The Betula platyphylla forest were 43.97%.respectively 42.06%.and 40.50%.(4)The soil water storage under different forest management modes showed the same trend as the soil capillary porosity.The soil water storage at Pinus tabuclaeformis forest under the close-to-nature management,no management and general management was 1635.78 t/hm2,1495.48 t/hm2,1357.54 t/hm2 respectively,and the Larix principis-rupprechtii forest was 1758.73 t/hm2,1693.64 t/hm2,1568.84 t/hm2 respectively.The Betula platyphylla forest were 1767.91 t/hm2,1687.39 t/hm2,1571.39 t/hnm2.(5)In summary,forest water conservation capacity(soil water storage plus maximum litter water holding capacity)showed a trend of close-to-nature management>no management>general management.The total storage capacity of the Pinus tabulaeformis forest,the Larix principis-rupprechtii forest and the Betula platyphylla forest was 1662.42 t/hm2,1789.39 t/hm2,1594.61 t/hm2 respec.tively,the no management was 1526.12 t/hm2,1732.35 t/hm2 and 1717.64 t/hm2,and the general management was 1379.18 t/hm2,1796.98 t/hm2 and 1592.90 t/hm2.