摘要
黑藻是一种广泛分布于我国各地的野生沉水植物,但在南方的一些养鱼场进行了人工种植。本文报道了如下内容:黑藻生产力的测定值;水温、光强度和植株密度对黑藻生产力的影响;种黑藻养鱼池中溶氧、二氧化碳和pH的昼夜变化规律,以及黑藻断枝的无性繁殖。
Hydrilla verticillata is a submerged aquatic vascular plant, distributed all over China. In the fifties, the experiments of planting Hydrilla in fish-ponds for rearing fingerling of grass carp have been carried out in Guangdong province. This paper reports the experimental results that the estimation valus of produotivity of Hydrilla; the effects of water temperature, light intensity and plant density on productivity; daily fluctuationn law of dissolved O_2, CO_2 and pH in fish-pond of planting Hydrilla and the cut branches propagation of Hydrlla.
1. Under the condition of light intensity of 8000 lx and water temperature of 28±1.5℃, after twenty times of estimation, the gross production (mgO_2/hr./0.5g fresh weight) of Hydrilla varies from 0.32 to 1.47. average 0.69; net production from 0.10 to 1.33, average 0.43; respiration from 0.07 to 0.50, average 0.26, According to the percentage of weight increase or decrease, the rate of photosynthesis in an hour varies from 0.34 to 3.04%, average 1.32%; rate of respiration in an hour varies from 0.25 to 1.65%, average 0.85%.
2. Under the condition of light intensity of 8000 lx, the water temperature is 30—40℃ at the time of the higher productivity. The net production is a minus quantity at 45℃ water temperature.
3. Under the condition of water temperature of 35℃, the light intensity is 4—6×10~4 lx at the time of the higher productivity.
4. Productivity reduces after the increase of the plant density, The optimum plant density should be 1500—3600 g/m^2, under this density, the collective production of Hydrilla becomes higher.
5. The daily flucturation of dissolved O_2, CO_2 and pH in the fish-pond of planting Hydrilla is very great, the daily difference in dissolved O_2 is 10 mg/l.
6. In May and June, the rooting and growing of cut branches is fast. when the rate of rooting reaches 80—100% and the time needs is 5—6 days. The relative growth rate of cut branches is 49—55 mg/g/day.
出处
《武汉植物学研究》
CSCD
1989年第1期77-85,共9页
Journal of Wuhan Botanical Research
关键词
黑藻
生产力
光合作用
Hydrilla verticillala
Productivity
Photosynthesis
Aquatic macrophytes
Cut branches propagation
