沙丘不同部位中间锦鸡儿人工林土壤养分特性及植物群落特征

Effects of Sand Dune Slopes on Soil Nutrients and Plant Community for Caragana intermedia Plantation

以青海共和盆地沙丘上12年生的中间锦鸡儿人工林为研究对象,并以流动沙丘为对照,探讨在沙丘上建立中间锦鸡儿人工林后,沙丘部位对土壤养分含量以及植物群落的影响。在中间锦鸡儿人工林内沙丘的迎风坡中部、坡顶、背风坡中部和流动沙丘采集土壤样品,深度为0 5,5 10,10 20和20 50 cm。结果表明:与流动沙丘相比,沙丘3个部位中间锦鸡儿人工林0 20 cm的有机质、0 50 cm的全氮和全磷含量得到显著提高。迎风坡中间锦鸡儿人工林0 5 cm深度的土壤有机质和全氮、0 20 cm深度的全磷含量显著高于坡顶和背风坡。在沙丘上建立中间锦鸡儿人工林后,草本植物种类、数量和植被盖度增加,迎风坡草本植物盖度明显高于坡顶和背风坡。

Abstract：This study was to determine how the soil nutrients and plant community were affected by slopes of sand dunes 12 years after Caragana intermedia plantation was established on the alpine sandy land of Gonghe Basin on Qinghai samples -Tibet Plateau. The moving sand dune in the vicinity of experiment site was chosen as a control. The soil were collected for four replicates from five depths （0 - 5, 5 - 10, 10 - 20, 20 - 30 cm and 30 - 50 cm） on windward slopes, tops of slopes and leeward slopes. The results showed that the soil organic matter content at 0 - 20 cm, total nitrogen and total phosphorus content at 0 - 50 cm for all sand dunes slopes of C. intermedia plantation were significantly higher than that of the moving sand dune. The soil organic matter and total nitrogen contents at 0 - 5 cm and total phosphorus content at 0 - 20 cm for windward slopes were significantly higher than that at the top of slopes and leeward slopes. The establishment of C. intermedia plantation on sand dunes facilitated the colonization and development of herbaceous species. The coverage and species of herbaceous increased, espe- cially for windward slopes.