不同退耕还林林草模式土壤与林草间氮素变化规律研究
文献类型:期刊论文
作者 | 王海明![]() |
刊名 | 水土保持研究
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出版日期 | 2006 |
卷号 | 13期号:2页码:124-127 |
关键词 | 林草生态系统 氮素 退耕还林 林草混交 |
其他题名 | Study on the Soil Nutrient and Tree and Grass Nutrient Content Cycle of Different Forest and Grass System in Converting Agricultural Lands to Trees |
通讯作者 | 王海明 |
合作状况 | 其它 |
中文摘要 | 林草复合生态系统在退耕还林中起着重要作用,对四川盆周山地退耕还林中三种退耕还林模式氮素动态进行初步研究。以揭示林草混交的实质,为林草混交提供理论支撑。研究结果表明:在各模式中,土壤氮素含量均表现为上层高于下层。在模式Ⅰ中,土壤速效氮与杉木叶氮含量呈负相关。杉木与黑麦草的氮素动态变化趋于一致;在模式Ⅱ中。速效氮受植物吸收作用影响大。毛白杨和黑麦草全氮含量与土壤上下层速效氮含量与变化呈负相关;模式Ⅱ速效氮在整个生长季节呈上升趋势。模式Ⅰ中水解氮在整个生长季节内元积累和大波动,吸收和矿化持平。水解氮与杉木叶片氮呈负相关;模式Ⅱ土壤水解氮的变化呈波峰曲线。模式Ⅲ中.全年无明显高峰,水解氮变化不规则.二者无相关性。杂交竹与牛鞭草之间氮素有相同的变化趋势。 |
英文摘要 | Forest and grass ecosystem plays a very important role in converting agricultural lands to forest.The authors make a preliminary study on dynamics of nutrient elements about three different f0rest—grassland pattern around the Sichuan Basin in order to know about essence of forest and grassland ecosystem and provided theory for forest mixed with grassland.The result shows that:in Pattern I,the soil nutrient content is much higher in the upper soiI than that in the below;the soll available N and C.1anceolatta N shows the negative relative.The N dynamic of C.1anceolatta with L.multiflorum reaches unanimity and shows very clearly positive relativity.In the Pattern Ⅱ.the function of plant absorption influences severely the soil available N.The variety of N content of T.tomentosa and L.multiflorum is the same.The N content increases when their growth is flourishing.The soil N can almost supply them in this time、In the Pattern Ⅲ .the soil available N increases from the beginning to end.In Pattern I,hydrolysable N has no accumulation and fluctuation,and absorbing and depositing is equa1.The hydrolysable N and the C.1anceolatta N show negative relativity.The variety of hydrolysable N in the Pattern II presents the ware—peak curve.And it is higher in upper soil from Aug.to Oct.because the litter—fall began to decompose and which increased the organic N.In the Pattern III,the hydrolysable N has fluctuated in some degree.However.there isn’t apparent peak in the growing seasons.There is the same trend of total N in the leaves of B.pervariabilis×D.amopsis vah'dus and H emarthria. |
分类号 | S714 |
资助信息 | 国家科技部西部专项“四川省退耕还林科技示范工程” |
语种 | 中文 |
公开日期 | 2010-08-16 |
源URL | [http://ir.imde.ac.cn/handle/131551/1443] ![]() |
专题 | 成都山地灾害与环境研究所_成都山地所知识仓储(2009年以前) 成都山地灾害与环境研究所_山区发展研究中心 |
推荐引用方式 GB/T 7714 | 王海明. 不同退耕还林林草模式土壤与林草间氮素变化规律研究[J]. 水土保持研究,2006,13(2):124-127. |
APA | 王海明.(2006).不同退耕还林林草模式土壤与林草间氮素变化规律研究.水土保持研究,13(2),124-127. |
MLA | 王海明."不同退耕还林林草模式土壤与林草间氮素变化规律研究".水土保持研究 13.2(2006):124-127. |
入库方式: OAI收割
来源:成都山地灾害与环境研究所
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