Journal of Food, Agriculture and Environment

Growth dynamics and soil water ecological characteristics of Tamarix Chinensis Lour. forests with two site types in coastal wetland of Bohai golf

Author(s):

Jiang-bao Xia ¹, Shu-yong Zhang ², Guang-can Zhang ²*, Jing-wei Xu ³, Jing-tao Liu ¹, Chuan-rong Li ², Hongbo-Shao ⁴*

Recieved Date: 2013-01-10, Accepted Date: 2013-04-30

Abstract:

The growing process and diameter characteristics of 10-year-old of Tamarix chinensis Lour were analyzed by using trunk analysis method. Soil hydro-physical property of forests with density structures of 3600 trees·hm^-2 in seaward side and 4300 trees·hm^-2 in landward side were investigated in National Marine Ecology Special Reserve in Changyi City of Shandong Province, in the Bohai-golf of China. The results showed that: 1) There were significant difference in the indexes, tree height increment and the growth process of diameter with forests two site types. The growth status and its density structure of low density forests were superior to the high density forests in landward side. 2) The skewness (S_K) of diameter distribution had great distinction. The S_k (0.085) of low density forests approached to normal distribution, and its density structure was reasonable. While the S_k (0.303) of high density forest in landward side was partial to normal distribution, and its density structure was on the high side. The kurtosis (K) of two forests (one was -0.878, the other was -0.674) had little distinction and the density factor had little function to forest polarization. 3) The increment of diameter at root height and trunk stock of low density forests increased year after year without effect of density. But the increment of high density forests had declined from since 4 years, which was restricted by high density. 4) Forests of lower density in seaward side, some indexes expressing soil water ecological characteristics, such as soil bulk density, porosity, permeability and soil water-storing capability were much better than that of higher density in landward side, and these indexes of 0-20 cm were better than that of 20-40 cm. The forests of lower density in seaward side had obvious function of decreasing soil density and increasing soil total porosity. The soil initial infiltration rate, steady infiltration rate and infiltration coefficient of lower density forests in seaward side were times of 1.31, 1.60, 1.52 that of high density forests in landward side, respectively. The capacity of soil saturated water-storing, capillary and non-capillary porosity water-storing of lower density forests in seaward side was significantly larger than that of forests in landward side, increased by 6.0%, 2.8%, 46.4%, respectively, compared with the higher density forests in landward side. 5) According to the growth process and soil hydro-physical properties, the reasonable density of T. chinensisforests about 10 years old was 3600 per hm² (it is 240 per 667 m²), if the utilization of double cutting was not considered, it is also the reasonable planting density (proposing the space is 2.0×2.0m).

Keywords:

Tamarix chinensis Lour., soil hydro-physical property, soil water-storing capability, growth dynamics, coastal wetland quality

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Environment
Pages: 1492-1498

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