Nitrification in soils after different periods of dryness.
Nitrification in soils after different periods of dryness.
复制标题
DOI：
10.1007/bf01377763
复制
发表时间：
1960-01-01
期刊：
影响因子：
4.9
通讯作者：
Birch, H. F.
中科院分区：
文献类型：
--
作者：
Birch, H. F.
将C含量为1-6.9%、C/N为14-13.8的各种土壤样品风干3-15周，测定了复湿后19天内C矿化量、NH_4-N和NO_3-N的产生量，并与未干燥土壤的矿化量进行了比较。对于一个给定的干燥期，矿化成正比的土壤中的C含量，而矿化在一个给定的土壤中表现出显着的线性关系的时间的日志，土壤在空气干燥状态的湿润之前。在高腐殖土和低腐殖土中，湿润前干燥分别产生了相当于>1吨和约300磅/英亩（NH 4）2SO 4的额外N。可能的机制，涉及增加表面积和分解积累的有机物质，通过增强微生物活性，进行了讨论（见S。& F. [609]）。
Samples of a wide range of soils of 1-6.9% C content and 14-13.8 C/N ratios were air dried for 3-15 weeks, and the amounts of C mineralized and NH4-N and NO3-N produced during 19 days after remoistening were determined and compared with mineralization in undried soils. For a given drying period, the mineralization was proportional to the C content of the soil, while mineralization in a given soil showed a significant linear relationship with the log of time the soil was in an air-dry state before moistening. Drying before moistening produced extra N equivalent to >1 ton and about 300 Ib/acre (NH4)2SO4 in high-humic and low-humic soils respectively. The possible mechanism, involving increased surface areas and decomposition of accumulated organic matter by enhanced microbial activity, is discussed (See also S. & F. XXIII [609]).