土壤中^(14)C-葡萄糖的周转及其与土壤特性的关系

TURNOVER OF ^(14)C-GLUCOSE IN SOILS AND ITS RELATIONSHIP WITH SOIL CHARACTERS

研究了1 4 C 葡萄糖在 1 3种土壤中的周转。周转可以分为 3个阶段 :0～ 3d ,周转速率为 1 3× 1 0 - 1 ～ 2 5× 1 0 - 1 /d ,半周转期为 3～ 5d;3～ 2 8d,周转速率为 0 7×1 0 - 2 ～ 1 2× 1 0 - 2 /d ,半周转期为 5 8～ 97d ;2 8～ 2 94d,周转速率为 0 5× 1 0 - 3× 1 4×1 0 - 3/d ,半周转期为 491～ 1 5 0 4d。相关性分析表明 ,1 4 C 葡萄糖周转速率与土壤代谢熵 (qCO2 )呈显著性正相关 ;3～ 2 8d周转速率与土壤理化性质和生物学性质都无显著的相关性 ;2 8～ 2 94d周转速率与土壤总有机碳、全氮、CEC呈显著或极显著负相关 ,与土壤砂粒含量呈显著正相关。这一阶段1 4 C 葡萄糖的周转与土壤性质密切相关。

The turnover of 14 C\|glucose added in 13 soils was studied.The turnover rate of 14 C\|glucose can be divided into three phases:0～3d,3～28d and 28～294d.The range of the turnover rate and half\|life of 14 C\|glucose were 1\^3×10 -1 ～2\^5×10 -1 d -1 and 3～5d,0\^7×10 -2 ～1\^2×10 -2 d -1 and 58～97d, 0\^5×10 -3 ～1 4×10 -3 d -1 and 491～1504d,respectively.Correlation analysis showed that from 0 to 3days the turnover rate of 14 C\|glucose had significant positive correlation with soil qCO\-2,from 3 to 28days,the turnover rate of 14 C\|glucose had no significant correlation with soil physico\|chemical and biological properties.The turnover rate of 14 C\|glucose had significant or highly significant negative correlation with soil total organic carbon,tatal nitrogen,CEC and significant positive correlation with soil sand content during the period from 28 to 294days.Turnover of 14 C\|glucose during the third period has close correlation with soil properties.