破碎化次生林斑块面积及斑块隔离对大山雀繁殖成功的影响

研究了破碎化山地次生林中斑块面积及斑块隔离度对大山雀（Parus major)繁殖成功的影响，运用GPS定位系统确定了18块大，中，小3种类型的斑块及对照样点，观测了大山雀产第一枚卵时间，窝卵数，平均卵重，出雏量及雏鸟出飞量等生态指标，结果表明，斑块隔离度对大山雀繁殖成功没有影响，1999－2000年两年中，大山雀在连续分布次生林中的产卵时间平均早于各斑块中的产卵时间7．2d，各斑块间的产卵时间差异较小，连续分布次生林和较大面积斑块内的大山雀窝卵数略高于中，小面积斑块内的窝卵数，连续分布生林中的平均卵重最大，斑块面积对出雏量及雏鸟不量没有影响，中，小面积斑块内的巢损失率较高，最主要的原因是巢址竞争较激烈。

Effect of forest patch size and isolation on reproductive success of Great Tit in fragmented secondary- forests.

The effect of forest patch size and isolation on reproductive success of Great Tit (Parus major) in fragmented secondary-forests was studied in Zuojia Natural Protection Area of Jilin Province by collecting data on breeding success, clutch-size, laying date, egg weight, brood-size and number fledged of Great Tit in 18 large (20-30 hm2), medium (10-20 hm2), and small (6-10 hm2) patches, and two extensive forests (> 100 hm2). All the forest patches were GPS tested. The results showed that isolation had no effect on reproductive success of Great Tit, and Great Tit laid 7.2 days earlier in extensive forests than in all forest patches. Clutches in extensive forests and large forest patches were slightly larger than those in medium and small forest patches, and eggs were heavier in extensive forests than in the patches. Patch size had no effect on brood-size and number fledged. The lost rate of the nests was high in medium and small forest patches because of intense competition.