鸟类繁殖对策与环境因子，特别是食物因子密切相关。随着环境污染的加剧，鸟类食性组成及食物的安全性必然受到影响，进而可能促使鸟类改变其繁殖对策。本项目选择直线距离约110 km相对无污染的刘家峡和污染较严重的白银地区的农村居民区为研究地，以我国广布种（树）麻雀（Passer montanus）为研究对象，通过环志及摄像技术，观察比较两地（树）麻雀种群不同年龄组的繁殖特征（窝卵数、孵化率、雏鸟生长发育、出飞率和亲鸟递食率等）；通过比色法、气相色谱-质谱法、原子发射光谱法及样方法等，比较两地（树）麻雀抗氧化能力、免疫能力、食性组成、个体及食物中污染物积累水平和潜在食物利用性等，阐明（树）麻雀在自然环境基本相同但食物组成及质量不同的条件下，其繁殖对策的变化。项目旨在研究野外环境条件下，食物因子变化对（树）麻雀繁殖特征的影响，并探讨影响其繁殖对策的机制，为深入探究环境变化影响鸟类多样性提供参考。

Birds breeding strategies are closely related to the environmental factors especially to food factors. With the aggravation of environmental pollution, the feeding composition and food safety of birds will inevitably be affected, which prompted the birds adjust their reproductive strategies. The present project will select rural residential areas from Liujiaxia (a relatively unpolluted area) and Baiyin ( a serious polluted area) as the study sites, whose straight-line distance of about 110 km. Tree sparrow (Passer montanus), a widely distributed species in China, is chosed as the research object. Using banding and imaging technology, we are going to observe and compare the propagation characteristics of tree sparrow populations in different age group of these two study areas (clutch size, hatching rate, nestling growth rate and bird feeding rate); By colorimetry, ultraviolet spectrophotometry, gas chromatography - mass spectrum, atomic emission spectrometer and sampling method etc., we will do the comparison of antioxidant capacity, immunity, diet composition, individual and food pollutants accumulation level and potential food availability between these two study areas. Through the above researches, we hope to make it clear how the tree sparrows adjust or change their breeding strategy in the similar natural environment but the food composition and quality under different conditions. The project aims to explore the effects and influence mechanism of food quality on the breeding characteristics and reproductive strategies of Passer montanus in the field conditions and to provide a reference for further research on bird diversity protection.