An ecological study on the grassland of sloping vineyard

Abstract

The present experiments were performed by culturing grapes at the level land, slow slope and steep slope on April 5, 1968, and immediately thereupon grasses of exposed land were transplanted in the experimental vineyard Located at Yongdu-ri, Shindo-myon, Koyang-kun, Kyunggi Province. The seasonal changes of grassland vegetation, standing crop, net productivity, soil element and relationship between grass and fruit tree in the second growing season of 1969 were investigated. The results obtained are summarized as follows : 1. Although reinfall during the growth stage was sufficient, the amouunt of evaporation was greater than that of rainfall in April and October. Especially, the yield of grasses was markedly high in August when precipitation was abundant. 2. The importance value was high in the order of the following plants among the total 12 species at the level land : Zoysia japonioa(204/500) Digitaria sanguisalis(88/500) and phacelurus angustifolia(44/500). At the slow slope the plants among the total 13 species which were high in the importance value were in the order of Zoysia Japonica(2/5), Digitaria sanguinalis(1/5), phacellurus angustifolia, Cymbopogon gloringii and Erigeron canadensis. At, the steep slope, it was in order of Zoysia japonica, kummerowia striata, Digitaria sanguinalis, Phacelurus angustifolia, and Cassia nomame. 3. The dominant species of the three experimental plots was Zoysia japonica and the frequency and living cover increased, in general, as the growth was progressed. The total living cover increased by about 2.42 times at the level land, 2.67 times at the slow slope and 3.18 times at the steep slope at the vigorous growth stage compared with initial growth stage. 4. The standing crop was 12.0-39.1g/m2 at the level land, 15.4-450.6g/m2 at the slow slope and 16.0-504.8g/m2 at the steep slope. This indicates that the standing crop increases as the slope becomes steep. Such increase in, the standing crop showed a higher value than that of the prairie in Floride of the United States and natural grassland in Cholowon area of Kangwon Province. Net productivity was also higher than that of those areas described above. It showed an increasing trend as the slope became steep. 5. Daily productivity was 2-14.2g/m2 at the level land, 0.99-11.7g/m2 at the slow slope and 0.92-11.8g/m2 at the steep slope, which indicate a considerably higher productivity. 6. The number of common species between each plot was 10 species, and community coefficient calculated by frequency index and index of importance value was 86.2-90.1% and 89.2-91.9%, respectively. Table 12. Comparison of plants community coefficient between each areas. ◁표 삽입▷(원문을 참조하세요) 7. P₂O_(5) content of soil at the plot of a greater productivity of grasaland was high and the chemical composition of soil showed no significant relationship, with the productivity of grassland. 8. The sloping plot of a greater productivity of grassland also showed a higher production of grape leaves. ;본 실험은 1968년 4월 5일에 포도를 각 경사지에 재식 하고 곧 토지의 풀을 이곳 도로원에 이식한후 2차년도 인 1969년도의 growing season의 각시기에 있어서 초 지식샘의 계절적변동, 현재량, 순생산량, 토양양소 과 목과의 관계를 경기도 고양군 신도면 용두리에서 조사 한 것이다. 1. 생육동안의 강수량은 충분하였으나 4월과 10월은 강수량보다 증발량이 많았다. 강수량이 많은 달 특히 8월의 목초생산량은 상당히 높았다. 2. 중요치가 높은 식물은 평지에서는 전체 12종중 잔 듸(204/500), 바랭이(88/500), 쇠치기풀(44/500)등의 순서로 낮아지고 완경사지는 전체 13종중 잔듸가 전체 2/5 바랭이가 1/5이고 다음은 쇠치기풀, 개솔개, 망초 의 순서로 되며 급경사의 중요지는 잔듸, 매듭풀, 바 랭이, 쇠치기풀, 차풀등의 순서로 낮아지고 있고 모두 12종이 나타나고 있었다. 3. 세경사지의 Dominant species는 잔듸이고 생육이 진행됨에 따라 frequency와 living cover가 대체로 증 가 되었다. 즉 Total living cover는 생육초기에 비하 여 생육왕성기에 평지는 2.42배 완경사지는 2.67배 급 경사지는 3.18배 가량 증가되었다. 4. 각 경사지의 Standing crop은 평지가 12.0~39.61 g/㎡ 완경사지가 15.4~450.6g/㎡ 급경사지가 16.0~504.8g/㎡으로 경사가 급할수록 높았다. 이는 미 국의 Florida의 Prairie보다 높고 철원지대의 자연초 지보다 높은 치이다. Net productivity도 미국 Florida나 철원지대보다 높았고 경사가 급할수록 높은 결과를 나타냈다. 5. Daily productivity는 평지가 1.2~14.2g/㎡ 완경사 가 0.99~11.7g/㎡ 급경사가 0.92~11.8g/㎡로 상당히 높은 치이다. 6. 각 경사지간의 공통종은 10종이며 경사지간의 군락 계수는 빈도치수에 의하면 86.5~90.1%이고 중요치지수 에 의하면 89.0~91.9%이다. 7. 초지 생산량이 많은 a구의 토양내 P₂O_(5) 함량은 높았다. 기타 토양성분은 초지 생산량과 큰 관계를 보 이지 않았다. 8. 초지 생산량이 많은 경사지가 포도엽의 생산량도 높았다.