氮硫复合沉降对杉木幼苗营养元素的影响  

Effects of nitrogen and sulfur deposition on nutrient elements of Cunninghamia lanceolata(Lamb.) Hook seedlings under simulated experimental condition

作　　者：颜晓艺 张艳荷[1,3] 林凤莲[1,3] 吴承祯[3,4] 洪伟[1,3] 李键[1,3] 

机构地区：[1]福建农林大学林学院,福州350002 [2]福建农林大学生命科学学院,福州350002 [3]福建省森林生态系统经营与过程重点实验室,福州350002 [4]武夷学院生态与资源工程学院,南平354300

出　　处：《应用与环境生物学报》2016年第3期473-479,共7页Chinese Journal of Applied and Environmental Biology

基　　金：福建省科技重大专项(2012NZ0001)资助~~

摘　　要：采用随机区组设计模拟氮硫复合沉降实验,以CO(NH2)2为氮源、Na2SO4为硫源,模拟试验1年后,分别采集不同氮硫沉降水平下杉木枝和叶的样品,研究杉木幼苗在不同沉降水平影响下的生长以及枝和叶营养元素氮、磷、钾、钙和镁含量的变化及其相关性.结果表明:经过1年不同沉降水平处理后,幼苗胸径和地径在不同处理间差异显著(P<0.05),均为促进作用,与对照相比,中氮低硫水平促进效果较佳;枝和叶中氮、磷和钾含量在不同处理间差异显著(P<0.05),钙和镁在不同处理间差异不显著(P>0.05);氮沉降源与叶氮、枝氮、叶磷含量相关关系极显著,相关系数分别为0.86、0.81、-0.78,与叶钾、枝镁含量呈显著负相关,相关系数分别为-0.64、-0.63;硫沉降源与叶磷(r=-0.62)含量呈显著负相关.叶中氮与磷、磷与钾、枝中氮和镁含量相关关系极显著,相关系数分别为-0.79、0.84、-0.91,叶中磷和镁、钾和镁以及枝中氮和磷、钾与钙含量呈显著相关,相关系数分别为0.65、0.70、-0.66、0.72,其他相关关系不显著.以上表明,中低氮硫沉降水平可有效提高杉木氮、磷、钾、钙、镁元素的含量.(图2表3参46)This study aimed to understand the nutritional elements mechanism of Cunninghamia lanceolata （Lamb.） Hook seedlings in response to simulated nitrogen （N） and sulfur （S） complex depositions. The effect of N and S deposition on main nutritional elements in the branches and leaves of C. lanceolata was investigated, including N, phosphorus （P）, potassium （K）, calcium （Ca）, and magnesium （Mg）, as well as their correlation. The randomized block design was used with Na2SO4 as sulfur source and 46% CO（NH2）2 as N source. The results showed that the diameter？at？breast？height？and basal diameter increment of seedlings increased significantly （P 〉 0.05） after simulated deposition treatments, most obviously in treatments of medium-N and low-S depositions. The contents of N, P, K in branches and leaves changed significantly after treatments （P 〈 0.05）, while Ca and Mg did not （P 〉 0.05）. Correlation analysis indicated that N source was positively correlated to leaf N （R = 0.86） and branch N （R = 0.81）, but negatively to leaf P （R = -0.78）, leaf K （R = -0.64） and branch Mg （R = -0.63）; S source was negatively correlated to leaf P （R = -0.62）. There was significant difference between N and P （R = -0.79）, P and K （R = 0.84）, P and Mg （R = 0.65）, K and Mg （R = 0.70） in leaves, and N and Mg （R = -0.91）, N and P （R = -0.66）, K and Ca （R = 0.72） in branches. No significant difference was found between others. The results suggested that the deposition of medium and low-N and S can effectively promote the accumulation of nutritional elements in C. lanceolata seedlings.

关 键 词：杉木 氮硫复合沉降 营养元素 

分 类 号：S791.27[农业科学—林木遗传育种]