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Decades of ecological restoration on the Loess Plateau has achieved significant on-site benefits to reduce soil erosion and improve soil quality, with remarkable off-site effects of reducing sediment delivery to Yellow River. However, regional forest community succession is still far from being adequately developed. The Ziwuling forest region and its highly developed forest community, as an advanced eco-zone, can lend practical experience to other regions on the Loess Plateau and help to identify the most suitable tree species for a better regional restoration in the future. With the aim to systematically understand the potential effects of typical local tree species to soil properties, three typical and well-established artificial forests in the Ziwuling region, Robinia pseudoacacia, Pinus tabuliformis and Platycladus orientalis were investigated in this study, with the climax community Quercus wutaishanica as a reference. All the four forest type had comparable stand age (25 years). Soil samples from 0-20 cm layers were collected from those four plantations. The soil microbial biomass (carbon and nitrogen), soil enzyme (invertase, urease and alkaline phosphatase) activities and their correlations were measured and analyzed. The results showed that: 1) soil invertase activity ranged from 16.94 to 64.49 mg·g数十年来,黄土高原的生态恢复取得了显著的效益,不仅遏制了当地的土壤流失,改善了土壤质量,同时也减少了向黄河的输沙量.但是,区域森林物种和群落演替还远未得到充分发展.子午岭林区及其高度发达的森林群落,作为先进的生态区,可以将实践经验和知识借鉴到中国黄土高原的其他地区,有助于确定最有效的人工林树种,以便今后更好地进行生态恢复.为了系统地了解典型的当地树种对土壤性质的潜在影响,本研究以黄土高原子午岭天然次生林区生长状况较好的人工林(刺槐、油松和侧柏)为研究对象,并以子午岭林区顶极群落辽东栎天然林为对照,这4种林型具有较一致的树龄(25年)、立地条件等.采用传统方法测定4种乔木林0～20 cm土壤理化性质、土壤酶活性(蔗糖酶、脲酶和碱性磷酸酶)和土壤微生物生物量碳、氮.结果表明: 1)土壤蔗糖酶活性为16.94～64.49 mg·g |
