黄土高原4种植被类型的细根生物量和年生产量

应用生态学报

黄土高原4种植被类型的细根生物量和年生产量

邓强^1,2,李婷³,袁志友^1,4,焦峰^1,4**

(¹中国科学院水利部水土保持研究所, 陕西杨凌 712100; ^2中国科学院大学, 北京 100049; ^3西北农林科技大学资源环境学院, 陕西杨凌 712100; ⁴西北农林科技大学水土保持研究所, 陕西杨凌 712100)

出版日期:2014-11-18 发布日期:2014-11-18

Fine root biomass and production of four vegetation types in Loess Plateau, China.

DENG Qiang^1,2, LI Ting³, YUAN Zhi-you^1,4, JIAO Feng^1,4

(¹Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, Shaanxi, China; ²University of China Academy of Sciences, Beijing 100049, China; ³College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China; ⁴Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China)

Online:2014-11-18 Published:2014-11-18

摘要/Abstract

摘要：

细根(≤2 mm)在陆地生态系统净初级生产力的分配中占有重要地位，在碳循环和水土保持方面具有重要意义. 本文采用土钻法和内生长法，以黄土高原刺槐人工林、落叶灌木、退耕草地和沙蒿群落4种主要植被类型为对象，研究0～40 cm土层细根生物量、垂直分布和细根年生产量. 结果表明：细根生物量与纬度呈线性负相关. 4种植被类型0～40 cm土层细根生物量的大小顺序为落叶灌木(220 g·m^-2)>刺槐人工林(163 g·m^-2)≈退耕草地(162 g·m^-2)>沙蒿群落(79 g·m^-2). 退耕草地直径≤1 mm细根生物量占直径≤2 mm总细根生物量的74.1%，在4种植被类型中最高；4种植被类型细根生物量随着土层深度的增加而减少，最大值均出现在0～10 cm土层. 退耕草地0～10 cm土层细根生物量占0～40 cm土层总细根生物量的44.1%，显著高于其他3种植被类型；细根年生产量与纬度呈线性负相关. 4种植被类型0～40 cm土层细根年生产量大小顺序为退耕草地(315 g·m^-2·a^-1)>落叶灌木(249 g·m^-2·a^-1)>刺槐人工林(219 g·m^-2·a^-1)>沙蒿群落(115 g·m^-2·a^-1)，其中退耕草地显著高于其他3种植被类型. 退耕草地0～10 cm土层细根生产量占0～40 cm土层总细根生产量的40.4%，在4种植被类型中最高. 退耕草地细根周转时间为0.51 a，低于其他3种植被类型.

Abstract: Fine roots (≤2 mm) play a major role in biogeochemical cycling in ecosystems. By the methods of soil cores and ingrowth soil cores, we studied the biomass and annual production of fine roots in 0-40 cm soil layers of four main vegetation types, i.e., Robinia pseudoacacia plantation, deciduous shrubs, abandoned grassland, and Artemisia desertorum community in Loess Plateau, China. The spatial patterns of fine root biomass and production were negatively associated with latitudes. The fine root biomass in the 0-40 cm soil layer was in the order of deciduous shrubs (220 g·m^-2), R. pseudoacacia plantation (163 g·m^-2), abandoned grassland (162 g·m^-2) and A. desertorum community (79 g·m^-2). The proportion of ≤1 mm fine root biomass (74.1%) in the 0-40 cm soil layer of abandoned grassland was significantly higher than those in the other three vegetation types. The fine root biomass of the four vegetation types was mainly distributed in the 0-10 cm soil layer and decreased with soil depth. The proportion of fine root biomass (44.1%) in the 0-10 cm soil layer of abandoned grassland was significantly higher than those in other three vegetation types. The fine root productions of four vegetation types were in the order of abandoned grassland (315 g·m^-2·a^-1) >deciduous shrubs (249 g·m^-2·a^-1) >R. pseudoacacia plantation (219 g·m^-2·a^-1) >A. desertorum community (115 g·m^-2·a^-1), and mainly concentrated in the 0-10 cm top soil layer and decreased with the soil depth. The proportion of the annual production (40.4%) in the 0-10 cm soil layer was the highest in abandoned grassland. Fine roots of abandoned grassland turned over faster than those from the other three vegetation types.

邓强1,2,李婷3,袁志友1,4,焦峰1,4**. 黄土高原4种植被类型的细根生物量和年生产量[J]. 应用生态学报.

DENG Qiang1,2, LI Ting3, YUAN Zhi-you1,4, JIAO Feng1,4. Fine root biomass and production of four vegetation types in Loess Plateau, China.[J]. Chinese Journal of Applied Ecology.