Chin J Plant Ecol

Studies on the Accumulation Distribution and Cycling of Nutrient Elements in the Ecosystem of the Pure Stand of Subtropical Cunninghamia lanccolata Forests

Feng Zongwei, Chen Chuying, Wang Kaiping, Zhang Jiawu, Zeng Shiyu, Zhao Jilu, Deng Shijian

Chin J Plan Ecolo. 1985, 9 (4): 245-256.

Abstract ( 1931 )

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The accumulation, distribution and cycling of nutrient, elements were studied in a mature (21–23 yr. old)and pure stand of Cunninghamia lanceolata in Huitong County of Hunan Province, during 1980–1983. The results are summarized as follows:

1. Concentration of nutrient elements in organs of the C. lanceolata tends toward Ca>Mg>N>K>P. The highest concentrations of nutrient elements were found in the leaf and the lowest in the trunk.

2. Total accumulations of nutrient elements of tree layer, understorey layer and ground-cover layer were estimated to be 1993.83kg/ha, 34.46kg/ha and 166.91kg/ha respectively. Total accumulations of nutrient elements in one ton of standing crop were in the order of tree layer< understorey layer

3. Annual accumulations of nutrient elements in different layers in kg/ha were 112.71 for tree layer, 7.4 for understorey layer and 144.33 for ground-cover layer.

4. Annual mean amount of litterfall in the stand was 1764.35kg/ha, it appeared in two peaks in February and July. Content of nutrient elements in the litterfall was 56.07kg/ha, of which N: was 13.53, P: 3.94, K:3.49, Ca:27.17 and Mg: 7.94kg/ha.

5. Input of annual amount of nutrient elements through precipitation into the stand was 1107 ton/ha, of which N was 18.22; P, ll.10;K, 13.30; Ca, 35.09; and Mg, 43.56kg/ha.

6. Annual uptakes of nutrient elements in the stand in kg/ha was N:41.89, P:15.76, K:19.65, Ca:81.62 and Mg:46.56. The ratios of annual return and annual uptake of nutrient elements were N:0.43, P:0.49, K: 0.29, Ca:0.35, and Mg:0.39.

A Preliminary Study of the Biomass and Nutrient Elements Distribution in Cultivated Mongolian Pine Forests in the Zhanggutai Region, Liaoning Province

Jiao Shuren

Chin J Plan Ecolo. 1985, 9 (4): 257-265.

Abstract ( 1961 )

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The forests of cultivated Mongolian pines (Pinus sylvestris var. mongolica) in the sand lands of the Zhanggutai region are stands of high productivity of biomass, their growth depends mainly on the location of the sand dunes on which they grow and the type of forest cultivated. A great deal of nutrient elements are stored up in the tree layers and accumulated in the litters of such forests, the upper layer of soil under which is rich in humus, N and P and the content of which decrease gradually with the depth of soil. The biomass, the humus content and the components of the humic acid of the forest soil can be greatly increased and improved if Mongolian pines grow in cooporated with Populus pseudo-simonii to be a mixture forest.

The Polar Ordination of Evergreen Broadleaved Forests in Guangxi

Wang Xianpu, Zhou Yuli, Song Yongchang

Chin J Plan Ecolo. 1985, 9 (4): 266-273.

Abstract ( 2402 )

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30 releves were treated by polar ordination procedure. Four methods for construction of axis were adopted. They were: criteria of Bray & Curtis, of Yong & Lu, of Swan & Dix, and of Cottam, Goff and Whittaker. No significant difference was shown. The ordination graph obtained with the criteria of Yong & Lu, and of Bray & Curtis was more coincident with cluster analysis results. It implied that, after excluding the very irrelevant releves the only need for the establishment of the terminal stands was the variation of vegetation, no additional requirement would be necessary. But owing to avoid the terminal stands are too unrelated to rest stands, we suggest that in case those stands with 100 dissimilarity index could not be selected them as terminal stands. Thanks of the results of polar ordination were basically coincident with the cluster analysis results, it was proven that the cluster analysis can better reflect the relation between stands. Therefore, these two procedures, cluster analysis and polar ordination, are complimentary.

Studies on the Measuring Techniques of Interspecific Association of Lower-Subtropical Evergreen-Broadleaved Forests. I. The Exploration and the Revision on the Measuring Formulas of Interspecific Association

Wang Bosun, Peng Shaolin

Chin J Plan Ecolo. 1985, 9 (4): 274-279.

Abstract ( 2241 )

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The measured result of interspecific association on the forest communities was analysed in this paper, and the meaning of interspecific association index for ecological researches in the level of species population and community or vegetation also has been pointed out. The association coefficient and the X2 test are suitable for the measurement of interspecific association in lower-subtropical evergreen- broadleaved forests. But the percentage concurrence is suitable for the measurement of interspecific association among many communities in lower-subtropical evergreen-broadleaved forests.If a species frequence is 100%,the b and d values must be weighed as 1, the result will be even better, when the formulas 1–3, 5, 13, and 15 in the paper are used.

The Vegetation Belts and Forest Types of Jianfengling Mountain, Hainan Island

Hu Wanyi

Chin J Plan Ecolo. 1985, 9 (4): 280-296.

Abstract ( 2091 )

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The tropical forests of Jianfengling, Hainan Island can be divided into four vertical vegetation belts and six vegetation types.In the vegetation types, there are fifteen groups of forest-type classified according to the dominant undergrowths and their development status and specific abundance, and twenty five forest types classified according to similarity in species composition and abundance of the undergrowth, the living ground and the out layer of the forest, similar ecological conditions, similarity in the first tree layer in the dominant species or genera, and in the subdominant species or genera and accompanying species or genera.

The Relationship between the Vertical Distribution of Tropical Vegetation Types and the Water-heat Regime of the Jianfengling Mountain, Hainan Island

Zeng Qingbo, Ding Meihua

Chin J Plan Ecolo. 1985, 9 (4): 297-305.

Abstract ( 2461 )

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The characteristics and distribution of tropical vegetation types in the Jianfengling Mountain of Hainan Island have been discussed in this paper and it was found that the distribution was determined by elevation above sea level and the variation of water-heat regime. The vegetation of this region consists of several types, namely littoral thorn thickets, shrubby grassland, tropical deciduous monsoon forests, tropical evergreen monsoon forest mountainous rain forest and dwarf mountainous woodlands. With a tropical monsoon climate, the sunshine duration of the region is long. Generally it has 1632 to 2623 hours per year, so solar radiation is plenty and more than 12.0 to 14.0 kcal/cm per year. It is warm all the year round.The relationship between the water-heat regime and the distribution of tropical vegetation is a linear, index equation, i.e.:(a) Q=13.43–21.3H, where Q is total solar radiation. H is altitude above sea level with a correlation coefficient r= –0.84 and (b) T=25.0–0.006H r= –0.99,T is average temperature with a correlation coefficient.The precipitation of 1300 to 3000mm per year is higher than that in the nearby region.In low-altitude districts there is an obvious dry season, while in other districts water is abundant owing to the precipitation brought on by typhoons. Precipitation (R) increase with altitude is an index law: R= 1276.4e0.0009H r= 0.91.Therefore, the water-heat regime and the vertical distribution of tropical vegetation are closely related.

Application of Fuzzy Mathematics to Vegetation Classification of Scrub Vitex negundo var. heterophylla

Zhang Jintun

Chin J Plan Ecolo. 1985, 9 (4): 306-314.

Abstract ( 1965 )

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In this paper, Fuzzy clustering analysis is used to study the scrub of Vitex negundo var. heterophylla. The procedure of this method is as follows:1. The calculation of similarity matrix R: This is the same as other approaches. Various similarity coefficients may be used here.2. The transformation of R to Fuzzy equivalent relation R*:Make R2,R4,R8, …, if RK=R2K △ R* then, R* is a fuzzy equivalent matrix.3. Clustering: select suitable values of λ and cluster accordingly. Establishing the similarity matrix R: let rjk=l-djk/M(j,k=l,2, 3, …41) where rjk is the similarity coefficient of both quadrants j and k; M, the proper constant chosen at will to make 0

Numerical Classification to the Evergreen Broadleaf Forest in the Jinyun Mountain, Sichuan Province

Liu Yucheng

Chin J Plan Ecolo. 1985, 9 (4): 315-325.

Abstract ( 1804 )

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This paper is a report on numerical classification of median-law grade classification units in the evergreen broadleaf forests in the Jinyun Mountain, Sichuan Province by means of the point-centred quarter method of plotless sampling technique. It is divided into five formations according to the edificator determined by the important value in the first tree stratum, and eight groups of association based on dominant in the second stratum (i. e. shrub stratum). Then the dominants of grass stratum are found out in the same way and the associations are determined. It is identified that the numerical classification method is applicable to the classification of the median-law grade classification units in the evergreen broadleaf forest.

The 3rd National Scientific and Working Conference on the Mapping of Vegetation Was Held in Beijing

Zhuo Zhengda, Zhang Lihe

Chin J Plan Ecolo. 1985, 9 (4): 326-326.

Abstract ( 1609 )

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Review on 《Biological Methods of Prospecting for Mineral》

Kong Lingshao

Chin J Plan Ecolo. 1985, 9 (4): 327-328.

Abstract ( 1664 )

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