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黄土丘陵区人工林细根生物量及其影响因素

戴银月1,2,孙平生1,2,康迪3,邓健4,任成杰1,2,杨改河1,2*,韩新辉1,2,付广军5   

  1. 1西北农林科技大学农学院, 陕西杨凌 712100;2陕西省循环农业工程技术研究中心, 陕西杨凌 712100; 3西华师范大学,四川南充 637002; 4延安大学生命科学学院, 陕西延安 716000; 5陕西省治沙研究所, 陕西榆林 719000)
  • 出版日期:2018-08-10

Fine root biomass of artificial forests in loess hilly region and its influencing factors.

DAI Yin-yue1,2, SUN Ping-sheng1,2, KANG Di3, DENG Jian4, REN Cheng-jie1,2, YANG Gai-he1,2*, HAN Xin-hui1,2, FU Guang-jun5   

  1. (1College of Agronomy, Northwest A&F University, Yangling 712100, Shaanxi, China; 2Shaanxi Engineering Research Center of Circular Agriculture, Yangling 712100, Shaanxi, China; 3China West Normal University, Nanchong 637002, Sichuan, China; 4School of Life Sciences, Yan’an University, Yan’an 716000, Shaanxi, China; 5Desert Control Research Institute of Shaanxi Province, Yulin 719000, Shaanxi, China).
  • Online:2018-08-10

摘要:

为揭示黄土丘陵区人工林细根生物量变化差异及其关键影响因素,本文分析了该区主要造林树种细根生物量大小、垂直分布特征及其与植被群落多样性、土壤因子的关系。以8种人工林为研究对象,包括:柠条40 a、柠条30 a、柠条15 a、刺槐45 a、刺槐15 a、侧柏15 a、灌木混交(柠条与山杏1∶1混交)40 a及乔木混交(刺槐与侧柏1∶1混交)15 a,采用根钻法每隔10 cm采集0~30 cm土层细根。结果表明:细根生物量大小表现为侧柏15 a>刺槐15 a>柠条15 a;随着林龄的增加,柠条和刺槐人工林细根生物量均呈显著增加(P<0.05),柠条、刺槐从15 a到40和45 a分别增加了57.8%和41.0%;相似林龄混交林与纯林的细根生物量大小差异不显著;不同人工林细根生物量均表现为随土层深度增加而显著降低。基于RELATE的相关检验和“Best”模型的生物环境分析,黄土丘陵区人工林细根生物量与土壤理化性质显著相关(r=0.303,P<0.01),尤其是土壤全氮与有机碳含量对人工林细根生物量影响较大;而人工林细根生物量与植被群落多样性相关性不显著。说明随着恢复年限增加,土壤碳、氮含量提高,可以有效提高人工林细根生物量。
 

关键词: 土壤细菌群落, 根腐病, 当归, 生物有机肥料DZF-363

Abstract: To reveal the difference of fine root biomass among different artificial forests and the driving factors in hilly loess region, we collected fine root samples from plantations with different tree species and stand ages. Fine root biomass and its vertical distribution, community diversity, soil physicochemical properties as well as their relationships were investigated in eight artificial forests, including 40-, 30- and 15-year-old Caragana korshinskii; 45- and 15-year-old Robinia pseudoacacia; 15-year-old Platycladus orientalis; 40-year-old mixed shrubs (Caragana korshinskiiand Prunus armeniaca) and 15-year-old mixed Robinia pseudoacaciaand Platycladus orientalis forest. The results showed that fine root biomass in the 0-30 cm soil layer in artificial forests with same age followed the order of 15-year-old Platycladus orientalis > 15-year-old Robinia pseudoacacia > 15-year-old Caragana korshinskii. The fine root biomass of Caragana korshinskii and Robinia pseudoacacia forests increased significantly with the increases of stand age (P<0.05). The fine root biomass of 40-year-old Caragana korshinskii and 45-year-old Robinia pseudoacacia increased by 57.8% and 41.0% compared with that of 15-year-old Caragana korshinskiiand 15-year-oldRobinia pseudoacacia, respectively. There was no significant difference of the fine root biomass between the mixed forests and pure forests of similar stand age. The fine root biomass significantly decreased with the increases of soil depth. The results of RELATE (a nonparametric form of Mantel test) and “Best” model selection procedure showed that the relationships between fine root biomass and soil physicochemical properties were significant (r=0.303, P<0.01), with soil TN and SOC contents showing the greater impacts on fine root biomass. There was no significant relationship between fine root biomass and community diversity in different artificial forests. Our results suggested that fine root biomass of artificial forests can increase with the increases of stand age and thus soil carbon and nitrogen contents.

Key words: Angelica sinensis, soil bactetrial community, root rot disease, biological organic fertilizer DZF-363