| 摘要: |
| [目的]了解不同植被恢复模式对土壤生物学特性的影响,为科学评价退耕还林的生态效应提供依据.[方法]以黄土高原沟壑区陕西千阳县冉家沟流域为研究对象,选择农地(小麦地)为对照,分析侧柏天然次生林、不同林龄(5,20,30年)刺槐人工林、桃树林、荆条灌丛和苜蓿草地等不同植被恢复模式下,土壤理化性质、微生物量及酶活性的特征.[结果]在不同的植被恢复模式下,土壤理化性质均较农地得到改善;微生物量碳、氮、磷基本较农地显著增加,增幅分别为254.78%～35.72%,112.67%～6.8%和115.03～5.3%;过氧化氢酶、碱性磷酸酶、脲酶、蔗糖酶活性均比农地增强,增幅分别为95.84N～18.94%,119.51%～20.36%,229%～20%和250%～73%.土壤生物学特性的改变进一步促进了土壤性状的改善.相关分析结果显示,微生物量碳及氮、土壤酶活性与土壤有机质、全氮多呈极显著正相关.[结论]不同植被恢复模式对土壤微生物量和酶活性的影响不同,但均较农地有很大改善和提高,其中尤以刺槐林的生态效应最为明显. |
| 关键词: 黄土高原 沟壑区 植被恢复 土壤生物学特性 微生物量 酶活性 |
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| 基金项目:国家重大基础预研项目（2005CCA05300）;西北农林科技大学“青年学术骨干人才”专项 |
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| Effect of different vegetation restoration models on soil microbial characters in the gully region of Loess Plateau |
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| Abstract: |
| 【Objective】 The study was to find the effect of different vegetation restoration models on soil microbial characters and to provide scientific basis for assessing the ecological effects of "Grain for Green".【Method】 Soil physiochemical properties,microbial biomass enzyme activities in the soil under Platycladus orientalis,Vitex negundo,Robinia pseudoacacia,Medicago sativa L were studied,compared with the wheat land in Ranjiagou Catchment at the Qianyang county of Shaanxi province in China.【Result】 Soil physiochemical properties,microbial biomass enzyme activities increased apparently compared with the farmland.After different vegetation recoveries,soil microbial biomass C,N,P(SMBC,SMBN,SMBP) respectively increased by 254.78％-35.72％,112.67％-6.8％ and 115.03%-5.3％ as compared with the farmland.Soil enzyme activities also increased.The activity of soil Catalase,Alkaline phosphatase,Ureases and invertase all increased along with the vegetation rehabilitation ages by 95.84％-18.94％,119.51％-20.36％,229％-20％ and 250％-73％ as compared with the farmland.The change of soil microbial characters bettered the soil physiochemical properties.Soil microbial biomass C,N,enzyme activities were positively related to soil organic carbon,total nitrogen,suggesting that soil microbial biomass,enzyme were closely correlated with soil fertility and plant restoration could indirectly influence soil microbial characters.【Conclusion】 Different vegetation restorations had different effects on soil microbial biomass and enzyme activities,they were critical for the improvement of soil physiochemical properties and microbial properties,the eco-effect of Robinia pseudoacacia was the best. |
| Key words: the Loess Plateau gully region vegetation recovery soil microbial character microbial biomass enzyme activity |
