【摘要】：土壤胞外酶在生態(tài)系統(tǒng)生物地球化學(xué)循環(huán)過程中扮演著重要角色,然而關(guān)于土壤胞外酶活性的主控因子研究還不夠深入,特別是在偏堿性的鈣質(zhì)土壤區(qū)域相關(guān)研究尤其缺乏.本研究以典型喀斯特山區(qū)(木論國(guó)家級(jí)自然保護(hù)區(qū))的林地為研究對(duì)象,采集不同地形條件(不同坡位和坡向)、不同樹種(厚殼桂和傘花木)下的表層土壤(0~15 cm),測(cè)定了與碳、氮、磷循環(huán)相關(guān)的6種水解酶的活性及相關(guān)土壤理化性質(zhì).研究運(yùn)用方差分解,并結(jié)合多響應(yīng)置換過程以及冗余分析技術(shù)分析了地形、樹種和土壤理化性質(zhì)對(duì)土壤酶活性的影響.結(jié)果表明,坡位對(duì)土壤酶活性有顯著影響.樹種和坡向?qū)ν寥烂富钚缘挠绊懖伙@著.方差分解結(jié)果表明,地形、樹種和土壤理化性質(zhì)共同解釋了土壤酶活性變化的55.3%,其中土壤因子是影響酶活性改變的主要因子,解釋了44.2%的變異.而冗余分析的結(jié)果進(jìn)一步表明在土壤因子中,pH、總氮和無機(jī)氮是影響土壤酶活性變化的主要指標(biāo).研究首次量化了喀斯特地區(qū)小尺度內(nèi)地形、樹種及土壤理化性質(zhì)對(duì)土壤酶活性變化的影響.研究也說明了在喀斯特山區(qū)小尺度內(nèi)土壤酶活性的變化可由土壤理化性質(zhì)來表征.
[Abstract]:Soil extracellular enzymes play an important role in the biogeochemical cycle of ecosystem. However, the study on the main factors of soil extracellular enzyme activity is not deep enough, especially in alkaline calcareous soil areas. In this study, the forestland of typical karst mountain area (Muxuan National Nature Reserve) was used as the research object, and the topsoil (015 cm),) was collected under different topographic conditions (different slope position and slope direction) and different tree species (Cassia crassifolia and Umbrella). The activities of six hydrolases related to carbon, nitrogen and phosphorus cycling and the soil physicochemical properties were determined. The effects of topography, tree species and soil physical and chemical properties on soil enzyme activity were analyzed by variance decomposition, multi-response displacement process and redundancy analysis. The results showed that the slope position had a significant effect on soil enzyme activity. The effects of tree species and slope direction on soil enzyme activity were not significant. The results of variance decomposition showed that topography, tree species and physical and chemical properties of soil explained the variation of soil enzyme activity by 55.3%, among which soil factor was the main factor affecting the change of enzyme activity, which accounted for 44.2% of the variation. The results of redundancy analysis further indicated that the total nitrogen of pH, and inorganic nitrogen were the main indexes affecting the change of soil enzyme activity. The effects of small scale topography, tree species and soil physical and chemical properties on soil enzyme activity in karst area were studied for the first time. The results also show that the change of soil enzyme activity in karst mountain area can be characterized by soil physical and chemical properties.
【作者單位】： 中國(guó)科學(xué)院亞熱帶農(nóng)業(yè)生態(tài)研究所亞熱帶農(nóng)業(yè)生態(tài)過程重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院環(huán)江喀斯特生態(tài)系統(tǒng)觀測(cè)站;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0502404) 國(guó)家自然科學(xué)基金項(xiàng)目(31500405,41571295,31400462) 中國(guó)科學(xué)院百人計(jì)劃項(xiàng)目(Y523101030);中國(guó)科學(xué)院STS項(xiàng)目(KFJ-EW-STS-092)
【分類號(hào)】：S714.3
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本文編號(hào)：2346901