宁南典型退耕模式对土壤有机碳固存的影响

发布时间：2018-04-24 05:38

本文选题：宁南退耕区 + 土壤有机碳　；参考：《浙江农业学报》2017年03期

【摘要】：以宁南退耕区采取的5种主要退耕模式——纯山杏林、山杏+柠条林、山杏+山桃+柠条林、沙棘林和苜蓿人工草地为研究对象,以撂荒地为对照,探讨不同退耕模式对土壤有机碳固存的影响。结果表明:在100 cm土层内5种退耕模式和撂荒对照的土壤有机碳储量基本上呈现出随土层深度加深而递减的趋势,其中浅层(0~20 cm)是土壤有机碳固存的聚集层,且极显著高于其他层的土壤有机碳累积;100 cm土层累积的总碳量表现为山杏+柠条林山杏林沙棘林山杏+山桃+柠条林撂荒地苜蓿人工草地。从有机碳蓄积来看,在宁南山区采用单一的乔灌混交、乔木林或灌木林的退耕模式较采用人工草地或自然恢复的模式更有利于土壤有机碳的累积。
[Abstract]:In this paper, five main types of conversion models, pure apricot forest, Caragana korshinskii forest, Caragana korshinskii forest, Hippophae rhamnoides forest and alfalfa artificial grassland, were used as the research objects, and the abandoned land was used as the control. The effects of different models of returning farmland on soil organic carbon sequestration were studied. The results showed that in 100 cm soil layer, the soil organic carbon (SOC) reserves of five models of returning to farmland and abandoned control showed a decreasing trend with the depth of soil layer deepening, among which the shallow layer of 20 cm was the accumulation layer of soil organic carbon sequestration. The soil organic carbon accumulation in 100 cm soil layer was significantly higher than that in other layers. The total carbon accumulation in 100 cm soil layer was as follows: alfalfa artificial grassland in apricot Caragana forest, Hippophae rhamnoides forest, Caragana korshinskii forest and abandoned alfalfa field. From the perspective of organic carbon accumulation, using a single Arbor and Irrigation mixed in the mountain area of southern Ningxia, the conversion model of Arbor forest or shrub is more favorable to the accumulation of soil organic carbon than that of artificial grassland or natural restoration.
【作者单位】：宁夏农林科学院荒漠化治理研究所;宁夏防沙治沙与水土保持重点实验室;宁夏生态修复与多功能林业综合研究中心;
【基金】：“十二五”国家科技支撑项目(2015BAC01B01) 自治区一二三产业融合项目(宁夏多功能林业分区域研究与示范) 宁夏自然科学基金项目(NZ16095,NZ16106,NZ15121) 宁夏农林科学院科技创新先导资金项目(NKYJ-15-18,NKYJ-15-19)
【分类号】：S153.6

【参考文献】