文献类型：期刊文献

英文题名：Effects of Intercropping and Mowing Frequency on Biological Nitrogen Fixation Capacity, Nutritive Value, and Yield in Alfalfa (Medicago sativa L. cv. Vernal)

作者：Wang, Yao[1,2,3] Zhang, Jinsong[1,2,3] He, Chunxia[1,2,3] Meng, Ping[1,2,3] Wang, Jie[4] Gao, Jun[1,2,3] Xue, Pan[5]

第一作者：王雁;Wang, Yao

通信作者：He, CX[1];He, CX[2];He, CX[3]

机构：[1]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat, Res Inst Forestry, Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China;[2]Nanjing Forest Univ, Collaborat Innovat Ctr Sustainable Forestry Southe, Nanjing 210037, Peoples R China;[3]Henan Xiaolangdi Forest Ecosyst Natl Observat & Re, Jiyuan 454650, Peoples R China;[4]Acad Forestry Inventory & Planning, State Forestry & Grassland Adm, Beijing 100714, Peoples R China;[5]Jiyuan Forestry Bur, Jiyuan 454650, Peoples R China

年份：2025

卷号：14

期号：2

外文期刊名：PLANTS-BASEL

收录：;Scopus(收录号：2-s2.0-85215783431);WOS:【SCI-EXPANDED(收录号:WOS:001405748000001)】；

基金：This work is supported by the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (grant number CAFYBB2020SY001).

语种：英文

外文关键词：intercropping; mowing frequency; biological nitrogen fixation capacity; yield; nutritive value

摘要：Intercropping with legume forages is recognized as an effective strategy for enhancing nitrogen levels in agroforestry, while mowing may influence nitrogen fixation capacity and yield. This study investigated the rooting, nitrogen fixation, nutritive value, and yield of alfalfa (Medicago sativa L.) under intercropping and varying mowing frequencies (CK, 2, and 3) from 2021 to 2023, using walnut (Juglans regia L.) and alfalfa as experimental subjects. The results indicated that intercropping suppressed root growth, whereas increased mowing frequency stimulated root development in the topsoil (0-20 cm). Specifically, the average root length density, root surface area, and root volume from the twice- and thrice-mowed treatments increased by 18.26, 17.45, and 4.15%, respectively, in comparison to the control. The delta N-15 values of the intercropped alfalfa were significantly lower than those of the monocropped alfalfa (p < 0.05), with the delta N-15 values of the mowing-thrice treatment increasing by an average of 38.61% compared to the control. Intercropping suppressed alfalfa yield but did not affect the total nitrogen content in the leaves or the nutritive value, and all mowing treatments resulted in land equivalent ratios (LERs) greater than 1. Furthermore, increased mowing frequency enhanced both the nutritive value and yield of alfalfa. Our study suggests that intercropping with walnut can improve biological nitrogen fixation in alfalfa, and that adopting a mowing-thrice regime can optimize yield and nutritive value.