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青藏高原东缘生态环境脆弱,森林频繁遭到砍伐,生物多样性受到严重威胁,森林砍伐后的生态恢复成为研究热点。原生动物在生态恢复中作为指示生物起着重要作用。本文就未砍伐、砍伐后不同恢复时期(20年、10年和1年)生的川滇高山栎(Quercus aquifolioides)林的土壤理化性质和原生动物在生长季的变化进行比较研究,以探讨生长季不同月份、不同恢复期的原生动物数量变化规律,分析土壤理化性质与其相关性。结果表明:(1)恢复10年和1年的林地的鞭毛虫数量(193个/g干土,164个/g干土)显著高于原始林地(22个/g干土),肉足虫在恢复1年的林地中数量最多(600个/g干土),纤毛虫数量则随次生演替进程逐渐增多。(2)在生长季不同月份原生动物的数量呈先增加后减少的趋势。鞭毛虫和肉足虫的峰值分别出现在7月和8月,而纤毛虫的数量在7、8、9月明显高于6月。(3)原生动物数量与土壤理化性质密切相关。鞭毛虫数量与p H值呈显著正相关(P=0.019),纤毛虫数量与铵态氮(P=0.002)和碳氮比呈显著正相关(P=0.022),肉足虫数量与硝态氮(P=0.008)和碳氮比(P=0.016)呈显著负相关。结果显示,三种原生动物数量在生长季不同月份表现出较大的波动性,其数量变化受土壤理化性质等多种因素调控。纤毛虫数量对川滇高山栎林砍伐恢复有正响应,而鞭毛虫、肉足虫数量有负响应。
The eastern part of the Qinghai-Tibet Plateau is characterized by fragile ecological environment, frequent deforestation and serious threats to biodiversity, and ecological restoration after deforestation has become a research hotspot. Protozoa play an important role as indicator organisms in ecological restoration. In this paper, the soil physical and chemical properties of Quercus aquifolioides forest and the changes of protozoa during the growing season without cutting, cutting and recovery (20, 10, and 1 year) were compared to explore the growth The variation of the number of protozoa in different months and different convalescence periods was analyzed to analyze the correlation between soil physical and chemical properties. The results showed that: (1) The number of flagellates (193 / g dry soil and 164 / g dry soil) in 10 years and 1 year of restoration of forest land was significantly higher than that of the original forest (22 / g dry soil) The number of ciliates increased with the succession of secondary succession in the one-year restoration of forest land (600 / g dry soil). (2) The number of protozoa increased first and then decreased in different months of the growing season. The peaks of flagellates and carnivores occurred in July and August, respectively, while the number of ciliates was significantly higher in July, August and September than in June. (3) The number of protozoa is closely related to soil physical and chemical properties. There was a significant positive correlation between the number of flagellates and the value of p H (P = 0.019). The number of ciliate was positively correlated with ammonium nitrogen (P = 0.002) and carbon to nitrogen ratio (P = 0.022) Nitrogen (P = 0.008) and C / N ratio (P = 0.016) showed a significant negative correlation. The results showed that the numbers of the three protozoa showed greater volatility in different months of the growing season, and the changes in the number of the three protozoa were controlled by many factors such as soil physicochemical properties. The number of ciliates had a positive response to the cutting and restoration of alpine oak forests in Sichuan and Yunnan, while the numbers of flagellates and carnivores were negative.