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桂林会仙喀斯特湿地芦苇群落土壤养分及微生物活性

李艳琼,黄玉清,徐广平*,孙英杰,张中峰,何成新,黄科朝,何文   

  1. (广西喀斯特植物保育与恢复生态学重点实验室, 广西壮族自治区中国科学院广西植物研究所, 广西桂林 541006)
  • 出版日期:2018-01-10 发布日期:2018-01-10

Characteristics of soil nutrients and microbial activities of reed vegetation in the Huixian karst wetland, Guilin, China.

LI Yan-qiong, HUANG Yu-qing, XU Guang-ping*, SUN Ying-jie, ZHANG Zhong-feng, HE Cheng-xin, HUANG Ke-chao, HE Wen   

  1. (Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China).
  • Online:2018-01-10 Published:2018-01-10

摘要: 为探讨桂林会仙喀斯特湿地芦苇植物群落土壤养分垂直变化趋势和微生物活性特征,测定0~80 cm剖面土壤碳、氮、磷含量,微生物生物量碳(MBC)、氮(MBN)、磷(MBP)以及基础呼吸(BR)、呼吸势(PR)、微生物熵(qMB)和代谢熵(qCO2)等微生物活性指标,分析土壤养分含量与微生物活性特征的相关性。结果表明:(1)土壤总碳(TC)、有机碳(SOC)、无机碳(SIC)、全氮(TN)、有机氮(Org-N)均随着土壤深度的增加而减少,土壤速效氮(AN)、铵态氮(NH4+-N)、硝态氮(NO3--N)、全磷(TP)、速效磷(AP)、有机磷(Org-P)和无机磷(Inorg-P)含量在下层土壤中有所波动;SOC占TC含量比例较高,Org-N在TN中所占比例较大,Inorg-P含量略高于Org-P含量;(2)MBC、MBN、MBP主要集中在0~30 cm土层,且随剖面深度的增加,三者均逐渐降低,且土壤MBC与SOC、MBN与TN、MBP与TP均呈极显著正相关关系(P<0.01);(3)BR和PR均随土壤深度的增加而显著降低,而qMB随着土层深度的增加先升高再降低,qCO2的垂直变化整体呈下降趋势,但在中间土层间有所波动;(4)会仙喀斯特湿地芦苇群落土壤养分和微生物活性各指标之间均呈极显著正相关关系,土壤微生物活性特征是反映会仙喀斯特湿地土壤质量状况的重要指标。

关键词: 秋番茄, 日光温室, 沼液, 化肥, 品质, 产量

Abstract:

In order to elucidate the vertical variation of soil nutrients and the characteristics of soil microbial activities of reed vegetation community in Huixian karst wetland, soil samples at0-80 cm depth were collected to analyze soil nutrient (C, N, P) concentrations, microbial biomass C, N, P (MBC, MBN, MBP) and microbial activity index (i.e.basal respiration (BR), potential respiration (PR), microbial quotient (qMB) and metabolic quotient (qCO2)). The correlations among soil nutrients and soil microbial activity indictors were examined. The results showed that: (1) The concentrations of total C (TC), soil organic C (SOC), soil inorganic C (SIC), total N (TN) and organic N (Org-N) decreased with soil depth, while the concentrations of soil available N (AN), ammonium N (NH4+-N), nitrate N (NO3--N), total P (TP), available P (AP), organic P (Org-P) and inorganic P (Inorg-P) in subsoil fluctuated. SOC and OrgN played a dominant role in the contents of TC and TN, respectively. Meanwhile, the concentration of Inorg-P was slightly higher than that of Org-P. (2) The MBC, MBN and MBP were much higher in the 0-30 cm soil layer, and also decreased with the soil depth. The MBC, MBN and MBP were positively correlated with the concentrations of SOC, TN and TP, respectively. (3) The soil BR and PR showed a decreasing trend with soil depth. However, with the increase of soil depth, theqMB decreased after an initial increase. TheqCO2 decreased in soil profiles, with small fluctuation in middle soil layers. (4) There were positive correlations among soil nutrients and microbial activity indexes. Soil microbial activities are important indicators for reflecting soil quality in the Huixian karst wetland.
 

Key words: solar greenhouse, biogas slurry, autumn tomato, fertilizer, production, quality.