EFFECTS OF STARCH ADDITIONS ON N-TURNOVER IN SITKA SPRUCE FOREST FLOOR

被引：30

作者：

SCHIMEL, JP ^{[1
]}

HELFER, S ^{[1
]}

ALEXANDER, IJ ^{[1
]}

机构：

[1] UNIV ABERDEEN, DEPT PLANT & SOIL SCI, ABERDEEN AB9 2UE, SCOTLAND

来源：

PLANT AND SOIL | 1992年 / 139卷 / 01期

关键词：

CARBON; CATABOLITE REPRESSION; MINERALIZATION; N-CYCLING; STARCH;

D O I：

10.1007/BF00012851

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Starch and carboxymethyl starch were added to forest floor samples collected from a sitka spruce stand near Aberdeen, Scotland. Samples were incubated for one month and were periodically analyzed for respiration, biomass-C, net and gross N-mineralization/immobilization. Gross mineralization/immobilization was measured by using a N-15-isotope pool dilution technique. Starch additions did not significantly affect respiration rates or biomass-C but caused net immobilization. The mechanism of this appeared to be inhibition of the decomposition of N-containing soil organic matter by the available starch-C, which resulted in decreased gross mineralization. Carboxymethyl starch acted as a biocide, probably as a result of an osmotic effect.

引用

页码：139 / 143

页数：5

共 16 条

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