基于Meta分析的土壤呼吸对凋落物输入的响应

凋落物输入是影响土壤呼吸的一个重要因素,然而从国内外目前研究结果来看,土壤呼吸响应凋落物输入的影响因素尚不清楚。利用国内外已发表的30篇研究论文共1393对有效数据,通过Meta分析,从凋落物管理措施、气候、植被、地形、土壤理化性质等因素揭示凋落物输入对土壤呼吸的影响程度。研究发现:与清除凋落物处理相比较而言,(1)凋落物输入后显著增加了土壤呼吸,且土壤呼吸的增加程度呈现出倍增凋落物处理是自然凋落物处理的1.33倍;(2)不同气候条件下的土壤呼吸增加程度呈现出强降雨(>1000 mm)是微弱降雨(<1000 mm)的1.34倍,以及高温气候(>20℃)是低温气候(<20℃)的1.7倍;(3)土壤呼吸的增加程度在不同植被带下呈现出针叶林带(34.1%)>阔叶林带(28%)>混交林带(22%)>草地(17.3%)的趋势;(4)不同海拔梯度条件下土壤呼吸的增加程度呈现出高海拔(59.6%)>中海拔(34.2%)>低海拔(26.7%)的趋势;(5)不同土壤理化性质条件下的土壤呼吸增量呈现出低容重(77.5%)分别是中容重(26.9%)和高容重(18.0%)的2.9倍和4.3倍,同时中性土壤(79.6%)的呼吸增量远远大于酸性(28.2%)和碱性(24.1%)土壤的呼吸增量,以及高土壤碳氮比(81.2%)的土壤呼吸增量远远大于低土壤碳氮比(19.4%)和中土壤碳氮比(29.6%)的土壤呼吸增量。由此可见,凋落物输入后会导致土壤呼吸的显著增加,但是不同气候、不同植被、不同地形、不同土壤理化性质等条件下其土壤呼吸增加的幅度不同。

Response of Soil Respiration to Surface Litter Input Based on A Meta-analysis

Surface litter(hereafter‘litter’)input was an important factor affecting soil respiration.However,based on the current study results at home and abroad,the factors to influence the response of soil respiration to litter input were still unclear.1393 pairs of valid data from 30 published research papers were used for analyzing the effect of litter management,climate factors,vegetation factors,topography factors,and soil properties on the increase of soil respiration after litter input through a meta-analysis.The results showed that,compared with litter removal treatment:(1)Soil respiration is increased significantly after the input of litter,and the increase of soil respiration showed a doubled litter treatment is 1.33 times higher than that of natural litter treatment;(2)Under different climate conditions,the increase of soil respiration in the heavy rainfall condition(>1000 mm)was 1.34 times higher than that of in the weak rainfall condition(<1000 mm),and in the high temperature climate(>20℃)condition was 1.7 times higher than that of in the low temperature climate condition(<20℃);(3)The increase of soil respiration showed the trend of coniferous forest belt(34.1%)>broad-leaved forest belt(28%)>mixed forest belt(22%)>grassland(17.3%)under different vegetation zones;(4)Under different altitude gradients,the increase of soil respiration showed a trend of high altitude condition(59.6%)>medium altitude condition(34.2%)>low altitude condition(26.7%);And(5)under different soil physical and chemical properties,the increase of soil respiration in the low bulk density condition(77.5%)was 2.9 times and 4.3 times higher than that of in the medium bulk density(26.9%)and high bulk density(18.0%)condition,while the increase of soil respiration in neutral soil condition(79.6%)was far greater than that of in the acid soil(28.2%)and alkaline soil(24.1%)condition,and the increase of soil respiration in high soil carbon nitrogen ratio condition(81.2%)was far greater than that of in the low soil carbon nitrogen ratio(19.4%)and medium soil carbon nitrogen ratio(29.6%)condition,respectively.Therefore,the input of litter will lead to a significant increase in soil respiration,whereas which was different in different climatic zones,vegetation factors,topographic factors,and soil physical and chemical properties.