Seasonal responses in microbial biomass carbon, phosphorus and sulphur in soils under pasture
Seasonal responses in microbial biomass carbon, phosphorus and sulphur in soils under pasture
复制标题
DOI：
10.1007/s003740050267
复制
发表时间：
1997-05-01
影响因子：
6.5
通讯作者：
Syers, JK
中科院分区：
文献类型：
--
作者：
He, ZL;Wu, J;Syers, JK
通过田间试验研究了草地土壤微生物生物量对季节变化的响应。这些研究表明，在9个月的时间内，微生物生物量碳，磷和硫（生物量C，P，S），以及它们的比例（C：P，C：S和P：S）不同的土壤水分的变化和新鲜有机材料的输入。1993年10月至12月，当植物残体大量掺入土壤时，生物量C和S增加了150- 210%。生物量P在这段时间内没有增加，在干燥的夏季（7月至9月）下降了22-64%。生物量C、P、S与气温无明显相关性。生物量C和P最大在施用农家肥的土壤中，施用硫酸铵降低了生物量C和P。生物量的C：P、C：S和P：S比变化很大（9-276：1; 50-149：1;和0.3-14：1）。这反映了生物质在一年中的不同时间释放（当比例较窄时）或固定（宽比例）P和S的潜力。因此，生物量C、P和S的季节响应在控制牧草中C、P和S的循环以及最终调节植物P和S的有效性方面是重要的。牧草对磷的吸收量与牧草生物量和土壤有效磷库中磷的总量呈显著正相关。因此，微生物量磷和有效磷的同时测定可为磷的潜在植物有效性提供有用的信息。
The response of the soil microbial biomass to seasonal changes was investigated in the field under pastures. These studies showed that over a 9-month period, microbial biomass carbon, phosphorus and sulphur (biomass C, P, S), and their ratios (C:P, C:S, and P:S) responded differently to changes in soil moisture and to the input of fresh organic materials. From October to December (1993), when plant residues were largely incorporated into the soils, biomass C and S increased by 150-210%. Biomass P did not increase over this time, having decreased by 22-64% over the dry summer (July to September). There was no obvious correlation between biomass C, P, and S and air temperature. The largest amounts of biomass C and P (2100-2300 mu g and 150-190 mu g g(-1) soil, respectively) were found in those soils receiving farmyard manure (FYM or FYM+NPK) and P fertilizer, whereas the use of ammonium sulphate decreased biomass C and P. The C:P, C:S, and P:S ratios of the biomass varied considerably (9-276:1; 50-149:1; and 0.3-14:1, respectively) with season and fertilizer regime. This reflected the potential for the biomass to release (when ratios were narrow) or to immobilize (wide ratios) P and S at different times of the year. Thus, seasonal responses in biomass C, P, and S are important in controlling the cycling of C, P, and S in pasture and ultimately in regulating plant availability of P and S. The uptake of P in the pasture was well correlated with the sum of P in the biomass and soil available pools. Thus, the simultaneous measurement of microbial biomass P and available P provide useful information on the potential plant availability of P.