Chin J Plant Ecol

Study on Biomass of Tropical Mountain Rain Forest in Limushan, Hainan Island

Huang Quan, Li Yi-de, Lai Ju-zhang, Peng Guo-jin

Chin J Plan Ecolo. 1991, 15 (3): 197-206.

Abstract ( 2172 )

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The biomass distribution of tropical mountain rain forest (sampling plot area 1500m2, clear-cutting) in Limushan,Hainan Island is studied. The result indicated that the total biomass above ground was larger than the average value of the tropical area in the world. The total biomass is 507.242t/ha, among which the tree layer biomass was 492.65t/ha, lower alyer wood and grass. 13.94t/ha, woody liana 0.67t/ha, epiphyte 0.06t/ha and parastic plants 0.15t/ha. The LAI value is as high as 9.572. By the analysis of tree biomass distributing in each DBH class and sub-layer, the authors found that the forest might be disturbed 300 years ago, and this indicated the tropical forest need very long time to recover the climax state after disturbance. In order to estimate the biomass of the similar forest communities, 8 regressive models had been proposed. The models included the whole tree biomass (above ground), the trunk, bark, branch leaf, plank-but-tress, woody liana biomass and the leaf area.

A studies on Population Dynamics of Edificators Dominance in Spruce-Fir Forest

Cao Guang-xia, Liu Zhang-de

Chin J Plan Ecolo. 1991, 15 (3): 207-215.

Abstract ( 2194 )

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The growth of tree basal area was well described by logistic model. According to the model, the range of Breast Height Diameter (BHD) can be derived and the maximum growth rate of basal area can be found. The result showed that the growth rate of Picea purpurea are highest at BHD of 35—40cm,while Abies faxoniana at 50—55cm. The maximum growth phases of edificators in various forest are different.

Density and Biomass Dynamics of Pinus taiwanensis at Songyang County, Zhejiang Province

Zhang Li-quan

Chin J Plan Ecolo. 1991, 15 (3): 216-223.

Abstract ( 1954 )

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This study was carried out at Guanshanyuan, Songyang County,Zhejiang Province. Density and biomass dynamics as well as their interrelationship for Pinus taiwanensis populations are described. Pinus taiwanensis is one of the pioneer species in forest succession in this region. The analysis of the population dynamics of Pinus taiwanensis throughout the successional process revealed the following three phases.Until ca. 9–10 years after Pinus taiwanensis invades the stands, the density of population is increased by the recruitments along with increase of the mean tree weight and population biomass (phase Ⅰ).Thereafter, the population is in full density state, the biomass of population and the mean tree weight increases exponentially, while the density of population is decreased drastically by the self-thinning and the invasion of other broad-leaved trees (phase Ⅱ). The –3/2 power law of natural thinning is applicable to the population in this phase. When the broad-leaved trees reach the canopy of forest, although the mean tree weight increases slowly, the density and biomass of Pinus taiwanensis population decreases gradually (phase Ⅲ) until the population senesces and retreats from the successional series completely. At some special habitats such as rocky steep slopes and ridges, however, Pinus taiwanensis population can form such an edaphic climax community that the density and biomass of population and the mean tree weight can be in a stable state for quite long period(phase Ⅲ).

A Study of Chemical Contents in a Mixed Shrubland Near Baihuashan Mountain in Beijing

Huang Jian-hui, Chen Ling-zhi

Chin J Plan Ecolo. 1991, 15 (3): 224-233.

Abstract ( 2216 )

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Spiraea dasyantha, Myripnois dioica, Vitex negundo var, heterophylla are the three co-dominant spieces in a mixed shrubland in the region of Baihuashan Mountain. According to the chemicae content analysis of the plants (leaf, stem, branch, lateral root, taperoot) and soil in this study, it was found that different plants and different organs have very different contents of all chmical elements and content variation in different seasons. Ca and N have the highest accumulation among the ten elemtnts analysised in this shrub community. In the herb layer, the first six elements of accumulation are in the order of Ca>N>Al>Fe>K>Mg and Ca>N>Al>Fe>Mg>K in the litter layer, Ca>N>K>Mg>Fe>Al in the shrub layer. Ca was found to have highest content in soil nutrient pool and N is the second one also. The other eight elements are in the order of Na>Mg>K>Mn>Al>Fe>Zn>Cu. Thus the chemical content of plant and soil are related. The accumulation index, the ratio of accumualtion of nutrient elemtnts in plants to that in soil, can reflect the relationship. K, Fe and Al have the highest accumulation coefficient and Na has the lowest one.

Peroxidase in two Mangrove Species, Kandelia candel and Bruguiera sexangula Seedlings, in Response to Variation of Salinity Condition

Zheng Wen-jiao, Lin Peng

Chin J Plan Ecolo. 1991, 15 (3): 234-239.

Abstract ( 2293 )

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The activity and isozyme of peroxidase in leaf and root tip of the seedling of two mangrove species, Kandelia candeI and Bruguiera sexangula, cultivated in sand beds irrigated with seawates of different salinity were studied.The results showed that: (1) With increase in salinity, the activity of peroxidase in leaf of K. candel got enhanced in lower salinity (from 0 to 10) and decreased over 15‰ salinity, but the activity in root tip decreased as the salinity increased from 0‰ to 35‰. (2) The activity of peroxidase in leaf of B. sexangula declined with increasing salinity from 5‰ to 35‰, whereas that in root tip increased with salinity from 5‰ to 10‰, and began to decrease over 15. The decreasing trend slowed down in both leaf and root tip in the range of 25--35‰ salinity. (3) The peroxidase activity of Kandelia was less sensitive to salinity than that of Bruguiera. The results showed that peroxidase activity may be used as an indicator of salinity tolerance, ie. Kandelia can grow in higher salinity than Bruguiera. (4) Electrophoresis maps of peroxidase isozyme in two plants on polyacrylamide gel indicated that the main isozyme bands were more stable than the low-class isozyme bands in response to salinity.

Studies on the Biomass Structure of Neosinocalamus offinif Population in Jinyun Mountain

Su Zhi-xian, Zhong Zhang-cheng

Chin J Plan Ecolo. 1991, 15 (3): 240-252.

Abstract ( 1996 )

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The biomass structures of Neosinocalamus affinis population and their influentive factors were studied at two levels (the population in community level and the population in individual level) using Harper′s the theory of moduler structure in Jinyun Mountain, the paper sums up the following was concluded from the result in Neosinocalamus affinis clone population the biomass distribution in the 5 age classes are 14.18%, 24.22%, 41.91%, 12.30% and 7.38%. And the current biomass of the population is 156.407t·ha-1; in the modular structure population of Neosinocalas affinis the biomass distribution per module unit of construction was 49.46% of clum, 21.34% of branch, 8.73% of leaf, 14.00% of rhizome, and 6.47% of root. In the zygote population of Neosinocalamus affinis in 200 ha, the total biomass was 31281 ton. And the proportions of above ground and the underground biomass are 79.53% and 20.47%.

A Preliminary Studies on the Biomass of Spodiopogon sibiricus Community on Woodland of Loess Plateau in North Shanxi Province

Zhu Zhi-cheng, Jia Dong-lin

Chin J Plan Ecolo. 1991, 15 (3): 253-263.

Abstract ( 2072 )

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Not only the distribution range of the Spodiopogon sibiricus community on woodland of the loess plateau in north Shanxi Province is widespread, its quality is also excellent. It occupies a very important position in animal husbandry. We have investigated the seasonal and spacial variation of both aboveground part and underground biomass in Spodiopogon sibiricus community. The result indicates that: the biomass seasonal dynamics was evident, the biomass of aboveground achieved peak value (243.1g/m2) in the midmonth of September; the biomass of underground was medium during the reviving period, minimum during flourishing period, maximum during the withering period. The observed facts are related to the stages and organic matter transport.

Preliminary Studies of Pinus henryi Forests in Daba Mountain

Fang Zheng, Ma Peng, Liu Jing-yan

Chin J Plan Ecolo. 1991, 15 (3): 264-273.

Abstract ( 2425 )

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Pinus henryi forest is mainly distributed over Daba Mountain region. By studying the distribution, ecotope conditions, floristic composition, structure and physiognomy and the dynamics of Pinus henryi forest growing well on Lipin area to the north of Micang Mountain ridge (32˚40′—32˚50′N, 106˚30′—106˚45′ E)in the southeastern part of Nanzheng County of Shaanxi Province, we showed the following characteristics of the species:

1. The specific composition of communities of Pinus henryi is related to the ecotope conditions. Although mixed with the broadleaf species and Pinus armandi, Pinus henryi usually dominates the forest. The structure of communities is relative stable.

2. The analysis of Pinus henryi population stracture and dynamics, the self-developmental processes and the natural regeneration indicated that Pinus henryi forest is in steady development.

3. Pinus henryi is a good timbersource. Making rational use and protecting resources is worthy of paying attention.

Studies on the Spatial Pattern of Population in Desert Vegetation——Standard Triangle Interpolation Method

Liu Jian-jun, Qian Xi-zhou, Shen Zhi

Chin J Plan Ecolo. 1991, 15 (3): 274-285.

Abstract ( 2187 )

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A standard triangle interpolation method for the study of the spatial pattern of population in plant communities is presented. In comparison with the method of 2-dimensional net function interpolation, it has many advantages. The new method offers all information that 2-dimensional net function provides, such as distribution pattern types of population individuals, total area of clumps et al. The most important is that its output is non-negative and no more skewed, which are the problems with the 2-D net interpolation. The results obtained using this standard triangle interpolation method are of higher accuracy.

The Relationships Between Primary Production and the Major Ecological Factors and its Prediction Models in Stipa baicalensis Steppe in Northeastern China

Wang Yu-sheng, Zhao Ni-shan, Xu Zhong0ru, Li Yuan, Hou Zhong-tian, Wu Xiu-qing

Chin J Plan Ecolo. 1991, 15 (3): 286-295.

Abstract ( 2090 )

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The paper, a synthesis based on data from our own investigation on Stipa baicalensis steppe for the period 1986-1988, deals with the relationships among biotic and abiotic factors at community ecology level. Analysis is applied to aboveground net primary production (ANPP), the energy source for livestock production process, with respect to accumulated temperature(≥5℃)(X1),rainfall in the growth season of the steppe plants (X2),and content of organic matter of surface soil (X3), which are the abotic variables most often used to explain variation in ANPP.

The models predicting ANPP in Stipa baicalensis steppe were structured in term of X1, X2, and X3. The predictive power of the models was found to be very high, and the models were successfully validated in three cases with an independent data set.

The prediction model that gave the best fit in Stipa baicalensis steppe was

Y 528.1328 + 12.1948X1 +82.5701001X2 +57.1987X3 + 12.6375X1X2

- 6.1265X1X3 + 28.0875X2X3 - 36.1774X12 - 31.4429X22- 26.2633X32

We have also made, in detail, the analysis of the relationships among ANPP and 3 ecological factors. ANPP was responsive to all of 3 ecological factors discussed in the paper. Action intensity, which has an effect upon ANPP, can be indicated by a contribution rate. The contribution rates of X1,X2, and X3 were 1.069, 2.0513 and 1.8889, respectively.