遮荫对刈割互花米草生物量及渗透调节物质的影响

以闽东滨海湿地分布的互花米草为研究对象，在野外开展为期3个月的刈割加不同遮荫率试验，测定互花米草生物量、游离脯氨酸、可溶性糖和可溶性蛋白含量等指标，分析不同遮荫率互花米草生物量和渗透调节物质的变化规律。结果表明：不同遮荫率对互花米草生物量、渗透调节物质有显著的影响，随着遮荫强度的加大，其生物量、可溶性糖、可溶性蛋白含量在不断减少，游离脯氨酸表现出增加的趋势。不同遮荫率互花米草叶生物量、茎生物量、样方内生物量、可溶性糖及可溶性蛋白含量均在90%遮荫处理达到最小值，分别为2.12、3.64、474.83 g、9.89、15.48 mg/g，分别占同期CK的43.35%、39.95%、45.16%、33.83%、33.04%，而游离脯氨酸含量在30%遮荫处理达到最小值58.42 μg/g，在90%遮荫处理达到最大值241.59 μg/g，说明高强度遮荫对互花米草生物量和渗透调节物质的影响更为显著，可以极大程度抑制互花米草的快速生长。各遮荫处理除了30%遮荫处理外，其他遮荫处理互花米草生物量、可溶性糖、可溶性蛋白以及游离脯氨酸含量与同期CK相比均存在显著差异。

Effects of Shading on the Biomass and Osmotic Adjustment Substances of Castrated Spartina alterniflora

Taking Spartina alterniflora distributed in Eastern Fujian coastal wetlands as the research object. In the field, a 3-month castration plus different shading tests were conducted to determine the biomass, free proline, soluble sugar and soluble protein content of S. alterniflora. The variation of biomass and osmotic adjustment substances of different shades of S. alterniflora was analyzed. The results show that Different shading rates have a significant effect on the biomass and osmotic adjustment substances of S. alterniflora. With the increase of shading intensity, the biomass, soluble sugar and soluble protein content of S. alterniflora are decreasing, and free proline shows an increasing trend. The leaf shading biomass, stem biomass, sample biomass, soluble sugar and soluble protein content of different shading rates reach the minimum at 90% shading treatment, which are 2.12, 3.64, 474.83 g, 9.89 mg/g and 15.48 mg/g respectively, accounting for 43.35%, 39.95%, 45.16%, 33.83%, 33.04% of CK, respectively. The free proline content reaches a minimum of 58.42 μg/g at 30% shading and a maximum of 241.59 μg/g at 90% shading, indicating high-intensity shading on S. alterniflora biomass and osmotic adjustment substances. The effect is more significant and can greatly inhibit the rapid growth of S. alterniflora. In addition to the 30% shading treatment, the shading treatment of S. alterniflora biomass, soluble sugar, soluble protein and free proline content ae significantly different from those of the same period.