【摘要】 栗钙土中硫以有机态为主，约占全硫的９３．５％，有机态碳结合硫约占有机硫的７７．３％．围栏封育提高了土壤中的有机Ｃ、Ｎ含量，使各种形态硫的绝对含量增加，但占全硫的比例变化不大。有机Ｓ增加量可解释全Ｓ增加的９６．７％，其中Ｃ—Ｓ可解释全Ｓ增加的５６．７％。围栏封育提高了土壤的微生物Ｓ量，加速硫的转化，增强土壤的供Ｓ能力，而且使有机物性质发生变化，表现在围栏内外有机Ｓ形态与有机Ｃ、Ｎ变化规律的不一致上。更多还原

【Abstract】 n Chestnut soil,93.5% of the total sulphur is presented in organic form,77.3% of organic sulphur is C-S.By fencing,there is an appeciable increase of soil organic C,total N and variouse forms sulphur content,but percentage of organic and inorganic sulphur doesn’t vary significantly.The increase of organic sulphur accounts for about 96.7% of total suphur increase,and C-S accounts for about 56.7%.By fencing,there leads increase of microbial biomass sulphur and capacity of providing available sulphur.The relationships among organic sulphur forms,organic C,total N showed different trends inside and outside fence.更多还原