Hu Chan-juan, Fu Bo-jie, Jin Tian-tian, Liu Guo-hua
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Ying Yong Sheng Tai Xue Bao. 2009 Jan;20(1):45-50.
Aimed to explore the effects of different vegetations and of the years of vegetation restoration on soil microbial biomass carbon and nitrogen, a comparative study was conducted, with the 5 year old Robinia pseudoacacia, Hippophae reamnoide and Prunus armeniaca plantations and the 5, 15 and 25 years old R. pseudoacacia plantation in the Yangjuangou catchment of Yanan City of Shaanxi Province, a typical hilly area of the Loess Plateau, as test objects. The results showed that among the three 5-year old plantations, H. reamnoides plantation had the highest soil organic carbon (SOC) and total nitrogen (TN) contents, while R. pseudoacacia plantation had the highest soil microbial biomass carbon (MBC) (99.56 mg x kg(-1)) and nitrogen (MBN) (28.81 mg x kg(-1)). The MBC was in the order of R. pseudoacacia > H. reamnoides > P. armeniaca, and that of MBN was of R. pseudoacacia > P. armeniaca > H. reamnoides. The MBC/SOC was in the order of R. pseudoacacia > H. reamnoides > P. armeniaca, and that of MBN/TN was of R. pseudoacacia > P. armeniaca > H. reamnoides, with the differences being significant (P < 0.05). With the increasing years of vegetation restoration, the soil pH in R. pseudoacacia plantation decreased, while the SOC, TN, electricity conductance (EC), MBC, and MBN all had an increasing trend, which illustrated that in the hilly area of Loess Plateau, planting R. pseudoacacia was more beneficial to the increase of soil MBC and MBN, and, with the increasing years of this planting, soil MBC, MBN, SOC and TN tended to be increasing.
为了探究不同植被类型以及植被恢复年限对土壤微生物量碳和氮的影响，在陕西省延安市羊圈沟流域（黄土高原典型丘陵区），以5年生的刺槐、沙棘和山杏人工林以及5年、15年和25年生的刺槐人工林为试验对象进行了对比研究。结果表明，在3种5年生人工林中，沙棘人工林的土壤有机碳（SOC）和全氮（TN）含量最高，而刺槐人工林的土壤微生物量碳（MBC）（99.56 mg·kg⁻¹）和氮（MBN）（28.81 mg·kg⁻¹）含量最高。MBC大小顺序为刺槐＞沙棘＞山杏，MBN大小顺序为刺槐＞山杏＞沙棘。MBC/SOC大小顺序为刺槐＞沙棘＞山杏，MBN/TN大小顺序为刺槐＞山杏＞沙棘，差异显著（P＜0.05）。随着植被恢复年限的增加，刺槐人工林土壤pH降低，而SOC、TN、电导率（EC）、MBC和MBN均呈增加趋势，这表明在黄土高原丘陵区，种植刺槐更有利于土壤MBC和MBN的增加，且随着种植年限的增加，土壤MBC、MBN、SOC和TN呈增加趋势。
