气候变化领域集成服务门户(CCPortal): Where to monitor the soil-water potential for scheduling drip irrigation in Populus tomentosa plantations located on the North China Plain?

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DOI	10.1016/j.foreco.2019.01.036
	Where to monitor the soil-water potential for scheduling drip irrigation in Populus tomentosa plantations located on the North China Plain?
	Yang T.; Li D.; Clothier B.; Wang Y.; Duan J.; Di N.; Li G.; Li X.; Jia L.; Xi B.; Hu W.
发表日期	2019
ISSN	0378-1127
起始页码	99
结束页码	112
卷号	437
英文摘要	Determining the optimal tensiometer placement is crucial for scheduling irrigation based on soil water potential (SWP) in poplar plantations. However, such work has never been done. The stand-age effect on the tensiometer placement is still unknown, hindering the development of a dynamic irrigation regime. In a surface drip irrigated Populus tomentosa, short-rotation plantation on sandy loam soil, the variation of SWP at different positions [hereafter expressed in spatial coordinates (distance from dripper in cm, depth in cm)] within the soil wetting volume (WV), and the daily tree growth rates were continuously monitored in one growing season. Whereas, the transpiration and fine root distribution were measured in two growing seasons. The HYDRUS model was calibrated using soil water and transpiration data from one growing season and validated using data in another growing season. Then the model was applied to simulate sixty scenarios, which were combinations of different SWP measurement positions (ten scenarios), root distribution patterns (three scenarios; mainly using rooting depth as a proxy for trees at different ages), and irrigation thresholds (two scenarios). Based on the simulation results, we estimated the ratio of actual to potential transpiration (T a /T p ) and irrigation efficiency (IE; calculated as (T a /T p )/irrigation amount) for each scenario. The absolute value of the mean relative difference of SWP was smaller at (15, 10) than at any other positions within the WV. The proportion of variation in growth (R 2 = 0.294) and transpiration rates (R 2 = 0.247) explained by root water-uptake was also highest at (15, 10). Fine roots concentrated on both sides of dripper as the trees grew bigger, with the maximal root density finally occurring at about (15, 10) and (−15, 10). Under the (−15, 10), (0, 10), (15, 10) and (0, 30) position scenarios, the T a /T p was at a high level relative to other scenarios, while the IE were at a middle level. As rooting depth increased, the ranks of different tensiometer positions in T a /T p and IE changed only a little, and T a /T p decreased slightly, implying the optimal placement should not vary with stand age. Therefore, tensiometer was recommended to place at 10 cm depth and about 15 cm distance from the dripper to schedule drip irrigation in different-aged P. tomentosa plantations on sandy loam soil. This will bring benefits to minimizing the use of irrigation water and maximizing production. Besides, the comprehensive approach used in this study can be adopted, when determining the optimal soil water measurement positions for scheduling irrigation for other plant species growing on other soil types. © 2019 Elsevier B.V.
英文关键词	Fine roots; HYDRUS; Irrigation management; Poplars; Temporal-stability analysis; Transpiration
语种	英语
scopus关键词	Forestry; Scheduling; Soil conditioners; Soil moisture; Transpiration; Fine roots; HYDRUS; Irrigation management; Poplars; Temporal stability; Irrigation; calibration; deciduous tree; drip irrigation; environmental monitoring; fine root; growing season; growth rate; hydrological modeling; irrigation system; plantation; sandy loam; soil water potential; stability analysis; stand structure; temporal analysis; tensiometer; transpiration; Depth; Forestry; Irrigation; Scheduling; Soil Conditioners; Transpiration; China; North China Plain; Populus; Populus tomentosa
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156157
作者单位	Ministry of Education Key Laboratory of Silviculture and Conservation, Beijing Forestry University, Beijing, China; New Zealand Institute for Plant & Food Research Ltd, Fitzherbert Science Centre, Palmerston North, New Zealand; Beijing Academy of Forestry and Pomology, Institute of Agriculture and Forestry Sciences, Beijing, China; Faculty of Agriculture, Forestry & Medicine, the Open University of China, Beijing, China; Sinton Technology Ltd, Beijing, China; New Zealand Institute for Plant & Food Research Ltd, Private Bag, Christchurch, New Zealand
推荐引用方式 GB/T 7714	Yang T.,Li D.,Clothier B.,et al. Where to monitor the soil-water potential for scheduling drip irrigation in Populus tomentosa plantations located on the North China Plain?[J],2019,437.
APA	Yang T..,Li D..,Clothier B..,Wang Y..,Duan J..,...&Hu W..(2019).Where to monitor the soil-water potential for scheduling drip irrigation in Populus tomentosa plantations located on the North China Plain?.Forest Ecology and Management,437.
MLA	Yang T.,et al."Where to monitor the soil-water potential for scheduling drip irrigation in Populus tomentosa plantations located on the North China Plain?".Forest Ecology and Management 437(2019).