关键词: 岷江柏, 表型性状, 环境因子, 种实, 天然种群

Abstract: A field experiment with different amounts of pig slurry as base fertilizer and panicle fertilizer was carried out in  Shanghai Farm to examine the impacts of pig slurry application on phosphorus absorption and utilization and the ecological stoichiometry of nitrogen and phosphorus in direct seeding rice. The results showed that pig slurry application had significant effects on dry matter accumulation and concentrations of nitrogen and phosphorus in direct seeding rice. The dry matter accumulation and yield of rice increased with the amount of pig slurry application. Phosphorus concentrations in the rice plants at jointing, heading, and mature stages and in straw and grain were significantly positively correlated with the amount of pig slurry application. During the growing season, plant N∶P ratios under different treatments ranged from 3.13 to 5.10, with the ranges of 3.13-4.83, 3.42-4.35 and 3.98-5.10 at jointing, heading and maturity stages respectively, being lower at the heading stage. Straw N∶P ratios showed greater variation, with a range of 4.30-6.57. The variation of N∶P ratios in grain was smaller, with a range of 3.85-4.37. Plant N∶P ratios at the heading and maturity stages, and that of straw and grain were significantly positively correlated with the total amount of pig slurry application, indicating that pig slurry application had a more considerable effect on nitrogen uptake than phosphorus uptake of direct seeding rice.

Key words: cone and seed, phenotypic trait, environmental factor, natural population, Cupressus chengiana.