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| Density structure and growth dynamics of Larix Principis-rupprechtii stand for water resource conservation in Wutai Mountain region in Shanxi Province |
| Zhang Guangcan1,Zhou Zefu1,2,Liu Xia1,Zhang Shuyong2,Chen Jian1,Han Wei1,Li Yanxiao1 |
| 1.Department of Soil and Water Conservation,College of Forestry,Shandong Agricultural University,271018,Tai'an,Shandong;2.Research Institute of Forestry,CAF,Laboratory of Tree Breeding and Cultivation,State Forestry Administration,100091,Beijing: China |
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Abstract To search after the adaptability on site and suitability on density of Larix Principis-rupprechtii Mayr.stand for water resource conservation,the growth process and diameter distribution characteristic of Larix Principis-rupprechtii Plantation in 10 years old were studied using stem analysis method of sample tree,which had two density structures(one was 2 600 per hm2,the other was 3 500 per hm2) in water conservation forest region of Wutai Mountain in Shanxi Province.The results showed that: 1) The tree height growth of two kind of forests were the same basically,and it was almost not affected by density.But the growth process of diameter and timber volume had great distinction.The growth status and its density structure of low density forests were superior to the high density forests.2) The Skewness(Sk) of diameter distribution had great distinction.The Sk(was 0.01) of low density forests approached to normal distribution,the density structure was reasonable,while the Sk(was 0.45) of high density forest was partial to normal distribution,the density structure was on the high side.The kurtosis(K) of two forests(one was-0.64,the other was-0.74) had little distinction and the density factor had little function to forest polarization.3) The growth of diameter at breast height,timber volume and trunk stock of low density forests increased year after year without effect of density.But the growth of high density forests had declined from since 6 years old,which was restricted by high density.4) The reasonable density of Larix Principis-rupprechtii Plantation about 10 years old was 2 600 per hm2,if the utilization of double cutting was not considered,it is also the reasonable planting density.
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Received: 14 September 2006
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TU Zhihua, FAN Zhiping, WANG Shanxiang, QIN Yiting, ZOU Yihua, YANG Zhaoming, WANG Jun, WEI Yongjian, WANG Qiong. Soil microbial biomass properties and its controlling factors under different vegetation types of water conservation forests in Dahuofang Watershed[J]. SSWC, 2019, 17(4): 130-140. |
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