土壤温度和含水率对幼、成蚓分解华北落叶松人工林凋落物的影响OA北大核心CSTPCD

To explore the differences in litter decomposition between juvenile and adult earthworms under different soil temperature and moisture conditions,the larch(Larix principis-rupprechtii)plantation in the Qinling Mountains of Shaanxi Province was used as the research object,and the indoor culture experi-ment of litter decomposition inoculated with earthworms was carried out using the microcosm method.Ju-venile and adult earthworms of Eisenia foetida were inoculated,respectively,and no earthworm was used as the control.Different gradients of soil temperature(T1:14,T2:18,T3:22 ℃)and moisture(M1:30％,M2:32.5％,M3:35％)were established to explore the effects of soil temperature and moisture content on litter decomposition and litter nutrient release by earthworms.The results showed that 1)at T1,with in-creasing soil moisture,the rate of litter decomposition of juvenile and adult earthworms decreased and the rate of litter decomposition of juvenile earthworms was 1.3 times that of adult earthworms at M3.At T2 and T3,with increasing soil moisture,the rate of decomposition of juvenile earthworms and adult earth-worms to litter increased and the rate of litter decomposition of adult earthworms was 1.05 and 1.18 times that of juvenile earthworms at M3,respectively;the release of C,N,P and cellulose into litter was enhanced by juvenile and adult earthworms.The release of lignin by juvenile and adult earthworms decreased with increasing soil moisture at T1 and T2,and increased with increasing soil moisture at T3.2)Under the same soil moisture,with increasing soil temperature,the decomposition of the litter and the release of C,N,P,cellulose and lignin in the litter were enhanced by juvenile earthworms and adult earthworms.3)The soil temperature and moisture had interactive effects on the litter decomposition rate of juvenile and adult earthworms.The effect of earthworms on litter decomposition was the strongest in T3M3,and the litter de-composition rates of juvenile and adult earthworms were 18.3％and 21.2％,respectively.The total carbon contents of the litter after the inoculation of juvenile and adult earthworms was the lowest at T3M3,which was 12.7％and 13.5％lower than that of the control,respectively.The total phosphorus content of the lit-ter after inoculation of juvenile and adult earthworms was the lowest at T3M2,which was 21.3％and 29.5％lower than that of the control,respectively.The inoculation of earthworms accelerated the decom-position of litter and the release of nutrients.Earthworms had the strongest decomposition effect on litter in T3M3.The responses of juvenile and adult earthworms to temperature and moisture were different.