文献类型：期刊文献

英文题名：Is it necessary to apply chemical weed control in short-rotation poplar plantations on deep soil sites?

作者：Fu, Jingyi[1] Zou, Songyan[1] Coleman, Mark[2] Li, Ximeng[3] Hu, Wei[4] Wang, Aoyu[1] Zhang, Pei[1] Zeng, Zihang[5] Ding, Changjun[6] Xi, Benye[1] Di, Nan[7]

第一作者：Fu, Jingyi

通信作者：Xi, BY[1];Di, N[2]

机构：[1]Beijing Forestry Univ, Minist Educ Key Lab Silviculture & Conservat, Beijing, Peoples R China;[2]Univ Idaho, Forest, Rangeland & Fire Sci, 875 Perimeter Dr, MS 1133, Moscow, ID 83844 USA;[3]Minzu Univ China, Coll Life & Environm Sci, 27 Zhongguancun South Ave, Beijing 100081, Peoples R China;[4]Food Res Ltd, New Zealand Inst Plant, Private Bag 4704, 4704, Christchurch 8140, New Zealand;[5]Beijing Forestry Univ, Sch Landscape Architecture, Beijing, Peoples R China;[6]Res Inst Forestry, Chinese Acad Forestry, Key Lab Tree Breeding, Cultivat State Forestry Adm, Beijing, Peoples R China;[7]Inner Mongolia Univ, Sch Ecol & Environm, Hohhot, Peoples R China

年份：2022

卷号：184

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20221912101857);Scopus(收录号：2-s2.0-85129702428);WOS:【SCI-EXPANDED(收录号:WOS:000805705300005)】；

基金：Acknowledgments This research was supported by the National Key Research and Development Program of China (Grant No. 2021YFD2201203) .

语种：英文

外文关键词：Competitive vegetation management; Industrial plantation forest; Intensive forest management; Chemical weeding; Populus

摘要：Chemical weed control has been widely applied in plantation forests around the world. However, understanding the long-term influence of weed control on stand growth and its underlying mechanisms is still limited. We conducted a six-year (2016-2021; an entire rotation) weed control study in Chinese white poplar (Populus tomentosa Carr.) plantations established using tall planting stock on a deep soil site, which is a typical affores-tation mode for poplars in north China. Three treatments of chemical weed control degree were implemented: no weeding (W-0), removing weeds within 50 cm distance from the tree row (W-50) and removing all weeds on the ground (W-150). Different tree growth indicators, soil water content (theta), tree root distribution, and soil physical properties were measured. There was no weed control degree effect on theta in 2017 (P = 0.4408) but significant theta difference (P = 0.0140) among treatments existed in 0-30 cm soil in 2021. Different degrees of weed control did not change soil physical properties (P > 0.05) after the long-term application of chemical weeding. There were no differences (P > 0.05) in all growth indicators. But the cumulative increments of tree diameter, height, stand volume index, and biomass at the end of the rotation in W-150 were numerically 2-27% lower than W-0 and 11-26% lower than W-50. The total fine roots biomass increased with decreasing weed control degree, although the difference was non-significant (P > 0.05). The fine root distribution pattern indicated that there might be many fine roots below 200 cm depth. The tree growth response to weed control may be attributed to tall planting stock that avoids light competition from weeds and deep soil resource exploration by tree roots that alleviate competition by shallow weed roots. Consequently, it may be unnecessary to apply chemical weed control in poplar plantations established using tall planting stock on deep soil sites. Our findings provide guidance for the sustainable management of industrial plantation forests.