WANG Hai-ming,CHEN Zhi-jian,LI Xian-wei,et al.Study on the Soil Nutrient and Tree and Grass Nutrient Content Cycle of Different Forest and Grass System in Converting Agricultural Lands to Trees[J].Research of Soil and Water Conservation,2006,13(02):124-127.
不同退耕还林林草模式土壤与林草间氮素变化规律研究
- Title:
- Study on the Soil Nutrient and Tree and Grass Nutrient Content Cycle of Different Forest and Grass System in Converting Agricultural Lands to Trees
- Keywords:
- forest and grass composite management; nutrient elements; dynamic variety; converting agricultural lands to forest
- 分类号:
- X171.1;S154.4
- 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Ⅲ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无积累和大波动，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。
- Abstract:
- 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 forest-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 PatternⅠ, the soil nutrient content is much higher in the upper soil than that in the below; the soil available N and C. lanceolatta N shows the negative relative. The N dynamic of C. lanceolatta 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 equal. The hydrolysable N and the C. lanceolatta 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 validus and Hemarthria.
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备注/Memo
收稿日期:2005-5-24;改回日期:。
基金项目:国家科技部西部专项“四川省退耕还林科技示范工程”
作者简介:王海明（1979- ）男，山西临县人，硕士，助理研究员，从事生态学、森林培育学和水土保持监测方面的研究工作。