The short-term effects of pruning and water-nitrogen regulation on the growth of Populus tomentosa and the distribution of available nitrogen in deep soil

Wang Yafei, Zhu Wei, Qu Guanbo, Ding Xiaofei, Xu Kexin, Jia Liming

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2026, Vol. 50 ›› Issue (4) : 155-164.

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2026, Vol. 50 ›› Issue (4) : 155-164. DOI: 10.12302/j.issn.1000-2006.202503024

The short-term effects of pruning and water-nitrogen regulation on the growth of Populus tomentosa and the distribution of available nitrogen in deep soil

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Abstract

【Objective】This study aims to clarify the response of Populus tomentosa forest growth and deep soil available nitrogen to pruning and water-nitrogen regulation, and provide theoretical reference for the optimization of efficient structural control technology for fast-growing tree species.【Method】Taking 5-year-old triploid poplar S86 in the Yellow River floodplain as the research object, a drip irrigation water-nitrogen coupling experiment was set up under different pruning intensities. By monitoring the growth characteristics of forest trees and the distribution of available nitrogen in the soil at [0,600)cm, the short-term effects of pruning and water-nitrogen regulation on the growth of P. tomentosa and the distribution of available nitrogen in deep soil were revealed.【Result】(1) Water and nitrogen additions had a significant impact on the individual tree volume, forest volume and annual forest productivity of P. tomentosa at the end of the growing season, but pruning and interaction did not play a significant regulatory role. Under non-pruning and pruning conditions, the annual forest productivity of the irrigated nitrogen treatment was significantly increased by 36.51% and 51.94% compared with the no fertilization or irrigation(CK)treatment. (2) From May to August, the relative growth rate (RGR) of the diameter at breast height of P. tomentosa under each treatment decreased month by month, and the diameter at breast height of the forest trees showed a “fast-slow” growth trend. Neither fertilization nor irrigation changed the growth rhythm of P. tomentosa, but pruning had a significant negative regulatory effect on the cumulative increase in diameter at breast height and RGR. (3) Pruning and pruning-water-nitrogen interaction effects have not affected the soil available nitrogen content in the [0,600)cm layer, but the addition of nitrogen fertilizer can increase the soil available nitrogen, especially in the [0,100)cm and [100,200)cm soil layers. The distribution of available nitrogen has both “surface aggregation” and “deep aggregation”.【Conclusion】The addition of water and nitrogen after pruning of P. tomentosa can inhibit the negative effects of pruning, promote the individual size development of forest trees and increase annual forest productivity, and at the same time supplement the available nitrogen content of forest soil. This study aims to provide a theoretical reference for the sustainable management of unknotted and large-diameter timber of P. tomentosa.

Key words

Populus tomentosa / pruning / water-nitrogen regulation / forest tree growth / deep soil available nitrogen

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Wang Yafei , Zhu Wei , Qu Guanbo , et al . The short-term effects of pruning and water-nitrogen regulation on the growth of Populus tomentosa and the distribution of available nitrogen in deep soil[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2026, 50(4): 155-164 https://doi.org/10.12302/j.issn.1000-2006.202503024

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