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Study on Population Age Structure and Spatial Distribution Pattern of Dryopteris Crassirhizoma Nakai

Author: LinHongMei
Tutor: YangLiMin
School: Jilin Agricultural University
Course: Ecology
Keywords: Dryopteris , CRASSICA , Morphological plasticity Multiple regression Age structure Point pattern analysis
CLC: S567.239
Type: Master's thesis
Year: 2005
Downloads: 197
Quote: 2
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Abstract


Coarse stems Dryopteris (Dryopteris crassirhizoma Nakai.) The Dryopteridaceae in Dryopteris perennial herb Pharmacopoeia Guanzhong's original plant, mainly distributed in Northeast China and northeast Hebei, North Korea, and with the distribution. In forests, altitude 300-1200m. The coarse stems Dryopteris life longer, up to 30 years. As the populations of natural regeneration and slow-growing medicinal parts, a lot of resources to develop the ecological carrying capacity is not strong. In order to achieve the sustainable use of resources, it is necessary to scientifically understand its population growth law, but so far no reported studies about the coarse stems Dryopteris population morphological traits, age structure and population distribution pattern. In this paper, on the basis of Jilin Changbai Mountain area the coarse stems Dryopteris population surveys, analysis of the morphological characteristics of coarse stems Dryopteris population, population distribution pattern, and preliminary research coarse stems Dryopteris individual age discrimination, as well as non-destructive methods of the survey population age structure, aims to reveal the of its morphogenesis update law, and to provide a reliable scientific basis for the sustainable use of coarse stems Dryopteris's. The field investigation on June 11, 2004 to August 22 of this study. Linjiang City located in southeastern Jilin Changbai Mountain area, geographically located at 126 ° 11'-127 ° 35'E, 41 ° 27'-42 ° 4'N located in the hinterland of the south west of the main peak of Changbai Mountain, the Yalu River upstream The forest coverage rate of 83.4%. Three different community types of sample sites are selected on the basis of full Tacha, are extremely heavy Yulin, the secondary weed trees and coniferous and broad-leaved mixed forest logging slash typical lot, basically reflects CRASSICA Dryopteris appropriate growth habitat conditions. The main findings are as follows: 1. Discovered through field survey, the coarse stems Dryopteris a growing season only long one blade valvate arrangement form between each blade, stop growth leaves natural death, leaving no rot petiole residues. Therefore, this article was first proposed as the basis for the individual age discrimination CRASSICA Dryopteris by counting residues rounds to round growth of leaves. By studies have shown that the method is practical and reliable, and has high operability, can be widely attempt Age structure applied to other similar ferns or perennial herbs. Divers to coarse stems Dryopteris age and ground some of the traits with significant correlation between plant age increased with the increase of the number of leaves, plant height, instructions can identify individual age and through aboveground features. Population characteristics of CRASSICA Dryopteris results show that: in the three plots, the secondary weed trees, the largest population density, intraspecific competition performance in a small plant biomass; the Deforested to population density mixed coniferous , but is located in the open area, vigorous plant growth, larger size, large biomass of each component of dry matter; daughter Yulin associated with red pine, herbaceous vegetation cover is very low (only 10%), canopy density coarse stems Dryopteris herbal dominant species aboveground plant growth is not enough strong, dry matter biomass. Single-sample t-test analysis showed that the inter-individual differences in morphological characteristics very significant, each morphological index differences within populations. F-test showed that: (1) the number of leaves, leaf length, leaf width, height, crown width, and number of sporophyll three populations the difference was not significant; (2) leaf fresh focus on the differences between the three populations

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CLC: > Agricultural Sciences > Crop > Economic crops > Medicinal crops > Herbal > Perennial > Other
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