CARBON DYNAMICS OF WETLAND IN THE SANJIANG PLAIN

1INTRODUCTIONWetlandsplayanimportant roleintheprocessofcar-bonstorage.Thetotalcarbonstoredindifferentkindsofwetlandsisabout15%-35%ofthetotalcarboninthegloballandsoils(POSTetal.,1982;GORHAM,1991).Inaddition,wetlandsaresignificantnaturalsources fortheatmospheric CH4 (MOORE,1994).It isestimatedthatabout110×1012gCH4 originates fromanaerobicdecompositioninthenaturalwetlands,CH4 emission fromthenaturalwetlandsis15%-30%oftheglobalCH4 emission andtheCH4 emission from thepeat land at hi…     

沼泽地CO2的释放：测量值低于估计值

沼泽地ＣＯ_２的释放：测量值低于估计值尽管农业排水活动被认为是过量ＣＯ２释放的主要因素，但由美国地质调查局展开的一项最新研究表明：加利福尼亚排水沼泽地的ＣＯ２释放量比以前的估计值低得多．加利福尼亚戴维斯地区Ｄｕｋｅ大学的水文学家ＳｔａｕｔＲｏｉｓｔａ?..     

三江平原沼泽地碳循环初探

在三江平原多年考察与研究的基础上，通过典型沼泽的定位观测，估算了三江平原沼泽土壤中的碳储量，探讨了沼泽植物对大气ＣＯ２的固定，碳素自沼泽土壤向大气的转移，沼泽近地气层ＣＯ２流，以及沼泽植物－土壤－大气之间的碳素流动。     

什么是“地球之肾”？

“湿地”,泛指暂时或长期覆盖水深不超过2米的低地、土壤充水较多的草甸以及低潮时水深不过6米的沿海地区,包括各种咸水淡水沼泽地,湿草句、湖泊、河流以及泛洪平原、河口三角洲、泥炭地、湖海滩涂、河边洼地或漫滩、湿草原等。     

当大泽湖的美丽将成往事

湿地湿地指天然或人工形成的沼泽地等带有静止或流动水体的成片浅水区,还包括在低潮时水深不超过6米的水域。湿地与森林、海洋并称全球三大生态系统,在世界各地分布广泛。湿地生态系统中生存着大量动植物,很多湿地被列为自然保护区。     

使采矿场铀分散减少到最小程度的生物地球化学作用

位于Ａｌｌｉｇａｔｏｒ河流域北部地区的Ｒａｎｇｅｒ铀矿山地处热带，具有一年一次的潮湿－干爆季风气候。随着 季节的开始，流经废石堆的径流在滞留池聚集（ＲＰ４）。这些径流水只有达到最小流量５ｍ＾３．ｓ＾－１时，才能排入附近的Ｍａｇｅｌ河，随后充入滞留池。排出水经过作为天然沼泽地过滤器的实验沼泽地和回流死水洼地的河道流入Ｍａｌｅｇａ 。该项研究检验了３个潮湿季节中和的水，１个潮湿季节未释放的水和４个干旱     

含煤岩系沉积学研究的几点思考

根据沉积学和煤地质学的理论和方法 ,对聚煤作用、聚煤中心、煤层在地层格架中的分布、煤的前身--泥炭和成煤基地--沼泽地 ,以及煤和煤系中的矿物组分--高岭石进行了介绍、分析、论述 ,并再次提出华北晚古生代海侵问题。     

The spatial—temporal dynamic characteristics of the marsh in the Sanjianlg Plain

Using the methods of combining landscape ecology with GIS spatial analysis,this paper analyses the dynamics of the marsh landscape stucture of the Sanjing Plain in the past 20 years,furthermore,taking Fujin County,located in the north of the plain,as an example,analyzes the conversion between marsh and other land use types.It is shown that the marsh in the Sanjiang Plain decreased greatly in the past 20 years,but the trend has begun to reverse,The marsh area decreased by 51.33% from 1980 to 1996,whereas it decreased by 4.19% from 1996 to 2000.The fragmentation of the marsh increased;the number of the patches increased by 326 from 1986 to 1996,whereas it only increased by 18 patches from 1996 to 2000,It is obvious that the speed of patches number diminished and the marsh fragmentation decreased,which shows that the reclamation of the marsh converted from the fragmentation to the brim in a large area of the marsh.The reclaimed marsh has mainly converted to paddy field and dry land .Large area of the marsh.The reclaimed marsh has mainly converted to paddy fiedld and dry land.Large-scale reclamation in the Sanjiang Plain influences its natural environment directly:the climate of the region turns from cold and wet to warm and dry,which makes the marsh both in the low-temperature northern part and in the deeply stagnant eastern part suitable for further agricultural development.