文献类型：期刊文献

英文题名：Soil respiration and its temperature sensitivity for walnut intercropping, walnut orchard and cropland systems in North China

作者：Lu, Sen[1] Zhang, Jinsong[1] Meng, Ping[1] Liu, Wenjuan[2]

第一作者：陆森

通信作者：Meng, P[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Beijing 100091, Peoples R China;[2]Hebei Agr Univ, Dept Agron, Baoding 071000, Peoples R China

年份：2012

卷号：10

期号：2

起止页码：1204-1208

外文期刊名：JOURNAL OF FOOD AGRICULTURE & ENVIRONMENT

收录：;Scopus(收录号：2-s2.0-84862179979);WOS:【SCI-EXPANDED(收录号:WOS:000305310800060)】；

基金：This research was supported by the Natural Science Foundation of China (No. 40871106, No. 40901108), and the Special Fund for Forestry Research in the Public Interest of China (No. 201104009-04).

语种：英文

外文关键词：Soil respiration; agroforestry system; temperature sensitivity; walnut intercropping system; carbon cycling

摘要：Agroforestry systems have unique advantages over conventional agricultural land in the carbon (C) balance. In this study, soil respiration under a tree intercropping system, an orchard and an agricultural land in north China were quantified during the growing season of March-November 2010. In the tree intercropping system, eight-year-old walnut (Juglans regia L.) was intercropped with an annual wheat (Triticum aestivum L.) - mung bean (Vigna radiata L.) rotation. In the orchard and cropland, the eight-year-old walnut and wheat-mung bean rotation were grown as a mono practice, respectively. During the study period, the overall soil respiration rate was 1.89, 1.63 and 2.05 mu mol m(2)s(1) for the walnut intercropping, walnut orchard and cropland systems, respectively. Thus, there was a reduction in soil respiration when the cropland was converted to walnut intercropping and walnut orchard in north China. The higher soil CO2 emission in the cropland result from the higher soil organic carbon and soil temperature. The van't Hoff model described the soil respiration as a function of soil temperature in the walnut intercropping system with R-2 > 0.78. Moreover, the temperature sensitivity of soil respiration (Q(10)) was determined in the walnut intercropping system. The Q(10) values were similar in the walnut intercropping system and walnut orchard at 2.33 and 2.28, respectively, and significantly greater than for cropland (1.59). The result suggests that the walnut intercropping system had a higher sensitivity of soil respiration to temperature change than agricultural land. Compared with cropland, the slightly lower soil organic carbon in the walnut intercropping system may due to the short-term agroforestry practice, while in general the soil organic matter requires long term of turnover interactions. There was no significant difference in the walnut basal diameter and tree height between orchard and intercropping systems, showing that walnut growth was not affected by the introduction of the crop. Our results suggest that walnut intercropping could be practiced above conventional agriculture and produced less soil CO2 emissions.