间伐强度对华北落叶松林穿透雨和树干茎流的影响

doi:10.16843/j.sswc.2018.03.010

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Abstract [Background] Quantifying the effects of different forest thinning intensities and stand structure on the partitioning of rainfall aims at providing scientific evidences in the forest management based on hydrology.[Methods] The designed experiment included 5 plots with the same slope orientation in a small catchment named Xiangshuihe of Liupan Mountains, Ningxia. All of the plots, with equal areas of 30 m×30 m, were on a slope and were laid out in a homogeneous Larix principis-ruprecitii plantation. One plot was not thinned and the other plots were thinned at four different intensities:14.1%, 37.4%, 43.0% and 53.4%, respectively. Twenty throughfall collectors (diameter 20 cm) for each plot were mechanically arranged and the throughfall under canopy in each rainfall event was collected from May to October 2012. Stemflow was also measured in each rainfall event in the growing season of 2012. In each treatment, 2 diameter classes were defined after thinning, and one representative sample tree per diameter class was selected for each. The bark on each sample tree was scraped off to smooth the surface in preparation for the fitting of a plastic collar. After the plastic collars were attached, plastic tubes were inserted into small holes located in the lowest part of the collars to collect the water in containers. The throughfall and stem-flow, was measured 17 times during the experiment time. Differences in the accumulated values of throughfall and stemflow among the treatments were analyzed with ANOVA.[Results] During the experiment period, the bulk rainfall was 507.2 mm, and the throughfall of L. principis-ruprecitii plantation in the control accounted 56.6% of total precipitation; whereas throughfall increased significantly with the increase of thinning intensity, and was 62.1%, 60.9%, 68.6% and 74.5% of the bulk rainfall, respectively corresponding to the thinning intensity of 14.1%, 37.4%, 43.0% and 53.4%. Stemflow decreased significantly with the increase of thinning intensity, and was 0.91%, 0.73%, 0.54%, 0.37% and 0.36% of the bulk rainfall, respectively corresponding to the thinning intensity of 14.1%, 37.4%, 43.0% and 53.4%. The canopy interception decreased 5.3%, 4.0%, 11.5% and 17.3%, respectively while compared with the control. Total throughfall was negatively and linearly correlated to the leaf area index, forest coverage, basal area, and tree density. In contrast, throughfall was modelled by considering these variables together with bulk rainfall in a multiple exponential expression(T=Re^aX), which simulated the throughfall with R²=0.95.[Conclusions] The results and prediction accuracy of the model may offer scientific basis for forest management based on hydrological basis. When the L. principis-ruprecitii was about 30 a, the thinning intensities was 43.0%-53.4% (Stand density:844-1 300 Trees/hm²) was the optimal range for increasing the throughfall in Liupan Mountains. Such ideal stand structure will be conducive to realizing the multiple goals,including the stable stand structure and regional water safety.

Key words： thinning throughfall stemflow Larix principis-ruprecitii plantation Liupan Mountains in Ningxia

Received: 03 September 2017

PACS:

S715.2

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	CAO Gongxiang
	WANG Yunni
	WANG Yanhui
	XU Lihong
	JI Meng

Cite this article:

CAO Gongxiang,WANG Yunni,WANG Yanhui, et al. Effects of thinning intensity on throughfall and stemflow of Larix principis-ruprecitii plantations[J]. SSWC, 2018, 16(3): 79-85.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.03.010 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I3/79

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