小花棘豆营养物质及能量分配对海拔高度的响应

测定了不同海拔高度下小花棘豆含水量,N、P、K等营养元素含量以及能量等指标,分析了不同海拔高度对小花棘豆植株各部分营养物质与能量分配的影响,研究了海拔高度对小花棘豆营养物质分配及生殖分配的作用规律。结果表明：N、P、K等元素随海拔高度的增加表现出逐渐增加的趋势,3种营养元素分别在海拔为2 400m,2 600m和2 400m时达到最高值;能量在根中表现为2 600m时最高,达26.01%,茎和叶中的变化在2 500m和2 600m较高,花中的能量分配在2 400m时最高,为27.00%。小花棘豆花和叶N、P、K的比例占总比较大,花在生长过程中消耗的能量也最多,说明N、P、K等营养元素和能量对其生长发育起到了重要的作用。

Response of nutrients and energy distribution of Oxytropis glabra on altitudinal gradient

Based on the test of water content,N,P,K,and energy distribution of Oxytropis glabra grown at different altitudes,the infuence of the altitude on nutrients and energy distributions of O.glabra was studied.The results showed that the nutrients of N,P,and K gradually increased with the increase of altitude.The highest value of N,P,and K appeared at the altitude of 2 400 m,2 600 m and 2 400 m,respectively.The highest energy content was 26% in root at 2600 m,while the highest values in stems and leaves were at 2 500 mand 2 600 m,respectively.The water content in roots,stems,and leaves were the highest value at 2 500 m,2 700 m,and 2 600 m respectively.The proportions of N,P,K and water in flowers and leaves were higher than that in roots and stems,and the flowers showed the largest energy consumption during the growth.