摘要
以湖南省邵阳县轻度、中度（弃耕地）和重度石漠化的灌丛生态系统为研究对象,采集3种不同石漠化程度的灌丛植物样品以及0～15、15～30、30～45 cm 3个土层土壤,研究土壤、植被养分的分配格局及相互关系.结果表明：土壤有机碳、全N含量在不同土层中差异显著,且其含量均随土层深度增加而减少,而全P、全K、全Ca、全Mg含量在各土层间无显著差异;3种石漠化程度灌丛土壤全N、全P、全Ca、全Mg含量差异显著,且中度石漠化样地土壤有机碳、全N和全P含量相对较高.轻度和重度石漠化土壤各元素含量排序均为有机碳〉全K〉全Ca〉全Mg〉全N〉全P,而中度石漠化样地土壤各元素含量排序为有机碳〉全K〉全Ca〉全N〉全Mg〉全P;3种石漠化程度植物各养分含量由高到低依次为Ca〉N〉K〉Mg〉P,且植物N、P含量和土壤全N、全P含量均呈显著正相关.土壤养分状况与植物生长密切相关,根据不同石漠化程度土壤养分状况,应该采用封山育林与人工造林相结合以及针对性施肥的方法来治理石漠化.
This research was conducted in light （LRD）, moderate （MRD, abandoned land） and intense （IRD） rocky desertification shrub ecosystems in Shaoyang, Hunan Province. We collected plant samples and soil at 3 layers （0-15, 15-30, 30-45 era）, and analyzed the distribution pat- terns of soil and plant nutrients and the relationships among them. Our results showed that the contents of soil organic carbon（SOC） and total N in different soil layers were various and decreased with soil depth, while the contents of total P, K, Ca and Mg had no obvious variation among the different soil layers. The contents of total N, P, Ca and Mg in soil were significantly different among the 3 rocky desertification shrub ecosystems, and the SOC, total N and total P in MRD were rela- tively higher than in the others. The rank of macroelement contents in soils for LRD and IRD was SOC〉total K〉total Ca〉total Mg〉total N〉total P, while it was SOC〉total K〉total Ca〉total N〉total Mg〉total P for MRD. The rank of macroelement contents in plants from the 3 rocky desertification shrub ecosystems was Ca〉N〉K〉Mg〉P, and the contents of N and P in plants were significantly positively correlated with the corresponding contents of total N and total P in soils. Soil nutrients were closely related to vegetation growth. According to the soil nutrient status of desertification plots of different grades, we should integrate the forest reservation with artificial afforestation and targeted fertilization methods for managing karst rocky desertification.
出处
《应用生态学报》
CAS
CSCD
北大核心
2016年第4期1015-1023,共9页
Chinese Journal of Applied Ecology
基金
国家林业局林业科学技术推广项目([2014]52号)
国家林业局荒漠化(石漠化)定位监测项目(20130910
20150618)
国家林业公益性行业科研专项(201404316)资助~~
关键词
灌丛生态系统
石漠化
植物养分
土壤养分
shrub ecosystem
rocky desertification
plant nutrient
soil nutrient
