Water Capacity Characteristics Of Litter And Soil In Different Forest Types Of Chinese Fir Plantations

To study the water capacity characteristics of litter and soil in different forest types of Chinese fir plantations (the pure Cunninghamia lanceolala、the mixed of Cunrimghamia lanceolata and Phyllostachys heterocyclacv, the mixed of Cunninghamia lanceolata and (Michelia macclurei Dandy、the mixed of Cunninghamia lanceolata and Pinus massoniana Lamb)in Jiangle litter. Reveals the dirences and rules of the water capacity characteristics of litter and soil under different mixed pattern and operating cycle, It is order to provides the basis of forest management and according to acertaint heoretieal meaning and practical reference value.Results show that:(l)In Chinese Fir plantations under different mixed pattern: the litter storage is9.571～24.43t/hm2,it decreased in the order of pure C. l.>the mixed of C. l.and P. h.> the mixed of C.l.and P. m.> the mixed of C. l. and M.m.; The maximum water-holding rate is162.9%～196.6,it decreased in the order of the mixed of C.I. and P. m.> the mixed of C. l.and P. h> pure C. l.> the mixed of C. l. and M.m; The totalwater holding capacity and modified interception is11.7～23.0t/hm2、9.18~19.49t/hm2,and decreased in the order of pure C. l.>the mixed of C l.and P. h.> the mixed of C.l.and P. m.> the mixed of C. l. and M.m.; the water absorption rates decrease in the order of the mixed of C. l.and P. h.> pure C. l.> the mixed of C. l. and P. m.> the mixed of C. l. and M.m.(2)In Chinese Fir plantations under different mixed patterns: the soil bulk density is1.09g/cm3~1.30g/cm3,and decreased in the order of pure C. l.> the mixed of C. l. and M.m.> the mixed of C. l.and P. m>the mixed of C. l.and P. h; the soil total and capillary porosity、saturated moisture capacity and capillary holding capacity decreased in the order of the mixed of C l.and P. h> the mixed of C. l..and P. m> the mixed of C. l. and M.m.> pure C. l, the saturated moisture capacity is3538.99～4083.77t/hm2.(3)ln Chinese Fir plantations under at different stand ages: the litter storage is4.38～31.79t/hm2t/hm2,it decreased in the order of the mature forest.>the pre-mature forest> the middle-age forest> the over-mature forest> young forest; The maximum water-holding rate is159.8%～217.1%,it decreased in the order of the mixed of youngF.> the middl F.> the mature F. the pre F>over F.; The totalwater holding capacity and modified interception is5.45～23.46t/hm2\5.03～14.33,and decreased in the order of mature F.>the pre F.> the middle F.> the over F.> the young F.; the water absorption rates decrease in the order of the mature F.>the pre F.> the middle F.> the over F.>the young F. (4)In Chinese Fir plantations under at different stand ages:the soil bulk density is1.05g/cm3～1.35g/cm3,and decreased in the order of the pre F. the middle F.>the over F.>the young F.; the soil total and capillary porosity、saturated moisture capacity and capillary holding capacity decreased in the order of the mixed of the young F.> the over F.> the mature F. middle F.>pre F.,the saturated moisture capacity is3902.83-4791.19t/hm2.(5)Study on water capacity characteristics of litter and soil layers by the comprehensive coordinate method based on evaluation of litter and soil layers shouw that:the water resources conservation function in Chinese Fir plantations under different mixed patterns is decreased in the order of the mixed of C.l. and P. h.> pure C l> the mixed of C.l.and P. m.-> the mixed of C.l. and M.m.;the water resources conservation function in Chinese Fir plantations at different stand ages is decreased in the order of the mature F.> the middle F.> the over.F.> pre.f.>young F.