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菌根是由土壤中的菌根菌与植物根系形成的互惠共生体,在植物生产力和生态系统碳循环过程中发挥着重要的作用。该文基于全球森林数据库,建立了包括全球森林菌根类型、净初级生产力(net primary productivity,NPP)和年平均气温等指标的新数据库。在此基础上,分析了6种菌根类型(丛枝菌根(arbuscular mycorrhiza,AM)、AM+外生菌根(ectomycorrhiza,ECM)、AM+ECM+内外生菌根(ectendomycorrhiza,EEM)、ECM、ECM+EEM和ECM+EEM+无菌根(nonmycorrhiza,NM))森林的总NPP、地上和地下NPP、树木主干NPP、树叶NPP,以及树木细根NPP对年平均气温变化的响应。结果表明,不同菌根类型的森林总NPP、地上和地下NPP虽然都随气温的升高呈现上升的趋势,但其响应程度因菌根类型的不同而有所差异。除AM和AM+ECM+EEM类型的森林外,其他4种菌根类型的森林总NPP都随年平均气温的增加而显著增加;随着菌根类型的不同,地上和地下NPP对年平均气温变化的响应程度也存在差异,在AM+ECM类型的森林中,气温对地上NPP变异的解释率最高,达到57.27%,而地下NPP仅在ECM类型和ECM+EEM类型的森林中呈现出与年平均气温显著的回归关系。树木主干、树叶和细根的NPP则随菌根类型的不同而变化,与气温变化呈现正、负相关关系。从AM与ECM类型的森林的NPP来看,无论是总NPP还是各个组成部分的NPP,ECM类型的森林的NPP对气温的响应总是较AM类型更为敏感。可见,不同类型的菌根通过影响森林不同部分的NPP对气温变化的响应程度而影响到森林NPP对气温变化的响应。这表明菌根类型是预测气温变化对森林NPP影响的重要指标。
Mycorrhizal is a reciprocal symbiont formed by mycorrhizal fungi in the soil and plant roots and plays an important role in plant productivity and ecosystem carbon cycle. Based on the Global Forest Database, a new database of indicators such as global forest mycorrhizal types, net primary productivity (NPP) and annual mean temperature has been established. On the basis of this, the effects of six kinds of mycorrhizal (arbuscular mycorrhiza, AM, ectomycorrhiza (ECM), AM + ECM + ectendomycorrhiza (EEM) ECM + EEM and ECM + EEM + nonmycorrhiza (NM)), NPP of above and below ground, NPP of tree trunk, NPP of leaf and NPP of tree. The results showed that the total NPP, the aboveground and the underground NPP of different mycorrhizal types all showed an upward trend with the increase of air temperature, but the response degree varied with different mycorrhizal types. With the exception of AM and AM + ECM + EEM types, the total NPP of the other four mycorrhizal types increased with the increase of annual mean temperature. With the different types of mycorrhizal, the average annual temperature In AM + ECM type forests, the interpretation rate of temperature on ground NPP variation is the highest, reaching 57.27%, while the underground NPP only shows the relationship with the years in ECM type and ECM + EEM type forests Significant regression of mean temperature. The NPP of tree trunk, leaves and fine roots varied with different mycorrhizal types, showing positive and negative correlations with temperature changes. From the NPP of AM and ECM forests, both NPP and NPP of ECM-type forests are always more responsive to air temperature than AM types. It can be seen that different types of mycorrhizae affect the response of forest NPP to temperature changes by affecting the response of NPP to different temperature changes in different parts of the forest. This indicates that mycorrhizal type is an important index to predict the impact of temperature changes on forest NPP.