A Study On Distribution Of C And P In The Wetland Soil Of Shengjin Lake, Anhui, China

Wetland, forest and ocean are the three most important ecosystems on the Earth. Wetland is called "the cradle of mankind",or "a gene pool of living things" and "the kidney of nature" because of the big productivity and significant ecological and environmental function. Particularly, Wetland is generally considered as carbon dioxide "sinks" and climate "stabilizer" on the global scale and has the vital significance in the global change study. With the rapid increase of world population and development of economy, wetland ecosystems have been degraded due to areal decline, water pollution and biodiversity reduction. Up to now, studies on wetlands of China have been concentrated on peat marshs of the Sanjiang Plain, of the Xing'an range and of the Nuo-ergai in the eastern part of Qinghai-Tibet Plateau. Freshwater wetlands had been extensive in the middle and lower reaches of the Yangtze River. Since the 1960's, wetland area in this region had been greatly declined due to cultivation by embankment. However, there are still some areas of freshwater wetlands left in the region. There has not been much available data of storage and cycling life elements such as C, N, and P in the wetland ecosystems.Shengjin Lake wetland, located in Chizhou Municipality, southern Anhui Province besides Yangtze River, is one of the fresh water marshes in the lower reach of Yangtze River. Taking Shengjin Lake wetland soil as an example, storage and distribution of C and P was studied in order to describe the sink effect of wetlands on C and P and offer some references for evaluation and protection of wetland ecosystems research results are as follows:1, Soil organic carbon (SOC) mean density was 10.82±1.90kg·m^-2, being higher than the adjacent natural soils and paddy soils and lower than those of high latitudes. Distribution of SOC down the profiles generally followed a power function. Moreover, SOC accumulation in the topsoil was found stronger than the cultivated paddy soil due to deep rooted zone. Spatial variability of SOC and N was shown prominent as affected by...