植被恢复方式对黄土丘陵区土壤理化性质及微生物特性的影响

doi:10.7522/j.issn.1000-694X.2014.00069

摘要/Abstract

摘要： 对甘肃省定西市黄土丘陵区不同植被恢复方式下的土壤水分、pH、有机碳（SOC）、全氮（TN）、碱解氮（AN）、全磷（TP）、速效磷（AP）、速效钾（AK）及微生物生物量、呼吸速率、呼吸熵（qCO₂）以及微生物熵（q_MB）进行了测定与分析。结果表明：不同植被恢复方式下，土壤pH值变化差异不显著（p>0.05）；0~20 cm土SOC、TN、AN、TP、AP、微生物量碳（SMBC）、微生物量氮（SMBN）含量及微生物呼吸速率（MR）均为天然植被（CL）下最高，AK为自然恢复（Q）方式下最高，qCO₂与q_MB在人工重建+自然恢复（RZ）方式下最高；20~40 cm土壤的SOC、TN、AN、TP、AP含量变化同0~20 cm，AK、SMBC、SMBN、 q_MB及MR在RZ方式下最高；40~60 cm土壤的SOC、TN、AN、AP及TP含量在CL方式下最高，SMBC、SMBN、 q_MB及MR在RZ方式下最高，AK、 qCO₂在Q方式下最高。相同植被恢复方式下，随土层深度增加，SOC、TN、AN、TP、AP、AK、SMBC、SMBN含量及q_MB、MR均逐渐降低，但qCO₂逐渐升高（除RZ方式）。不同植被恢复方式，SOC、TN、AN、SMBC、SMBN、q_MB、MR及qCO₂之间存在不同程度的相关性。

关键词: 黄土丘陵区, 植被恢复方式, 土壤微生物量, 土壤微生物呼吸, 呼吸熵

Abstract: Soil physical-chemistry (soil water content, pH, organic total carbon, total nitrogen, available nitrogen, total phosphorus, available phosphorus and available potassium) and microbial characteristics (soil microbial biomass, microbial respiration, metabolic quotient, microbial quotient) of different vegetation restoration modes were determined and analyzed in Dingxi loess hilly region. The results showed there was no significant difference of soil pH between different vegetation restoration modes. In 0-20 cm soil layer, pure plantation (CL) restoration mode had the highest content of soil organic total carbon (SOC), total nitrogen (TN), available nitrogen (AN), total phosphorus (TP), available phosphorus (AP), soil microbial biomass carbon (SMBC), soil microbial biomass nitrogen (SMBN) and microbial respiration (MR),natural (Q) restoration mode had the highest available potassium (AK), while artificial+natural (RZ) had the highest metabolic quotient (qCO₂) and microbial quotient (q_MB); In 20-40 cm soil layer, the highest content of SOC, TN, AN, TP and AP were consistent with 0-20 cm soil layer, AK, SMBC, SMBN, q_MB and MR of RZ restoration mode was the highest among the restoration modes while the highest of qCO₂ was in the restoration modes of Q. In 40-60 cm, the highest content of SOC, TN, AN, AP and TP appeared at CL restoration mode while SMBC, SMBN and q_MB, MR were at the RZ restoration mode, and AK and qCO₂ was the restoration modes of Q restoration mode. With the increase of soil depth, the content of SOC,TN, AN, TP, AP, AK, SMBC, SMBN, q_MB and MR reduced gradually, but qCO₂ rose gradually under the same vegetation restoration mode, which except for RZ restoration mode. Meanwhile, the result of correlation analysis indicated that there were significant correlations among SOC, TN, AN, SMBC, SMBN, q_MB, MR and qCO₂.

Key words: Loess Hilly Region, vegetation restoration modes, soil microbial biomass, soil microbial respiration, metabolic quotient

中图分类号:

钟芳, 柴晓虹, 王国基, 段争虎. 植被恢复方式对黄土丘陵区土壤理化性质及微生物特性的影响[J]. 中国沙漠, 2014, 34(4): 1064-1072.

Zhong Fang, Chai Xiaohong, Wang Guoji, Duan Zhenghu. Soil Physical-chemistry and Microbial Caracteristics under Different Vegetation Restoration Modes in the Loess Hilly Region[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(4): 1064-1072.

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