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为研究杉苗对氮素的需求,我们按0.0,0.4,0.8,1.2,1.6和2.0g氮/盆6个水平进行施肥,结果表明:1.杉木苗高、地径、干重、分枝数、分枝总长等均随着施氮量的增加而提高,但当施氮量超过1.2g氮/盆后,这些项目又随着施氮量的继续增加而下降。此外,杉苗的叶绿素含量、单株净光合强度、呼吸强度、光呼吸强度等对氮素的反应亦与此相似。2.苗木单株干重与单株光合强度、呼吸强度呈显著的线性正相关,但与单株光呼吸强度呈显著的线性负相关。3.植株根、茎、叶的全氮量随施氮量的增加而增加。4.叶全氮量与苗高、地径、单株干重及单株净光合强度、叶绿素含量之间呈分段回归的线性相关。
In order to study the nitrogen requirement of Cunninghamia lanceolata, we applied six levels of N, P and N levels of 0.0, 0.4, 0.8, 1.2, 1.6 and 2.0 g, respectively. The results showed that: The number of branches and total length of branch increased with the increase of N application rate. However, when N application rate exceeded 1.2g N / P, these projects decreased with the increase of N rate. In addition, Sugarcane seedling chlorophyll content, net photosynthetic plant intensity, respiratory intensity, photorespiration and other similar responses to nitrogen. The dry weight per plant of seedling had a significant linear positive correlation with photosynthetic intensity and respiration intensity, but had a significant linear negative correlation with the photorespiration intensity of individual plants. The total nitrogen content of plant roots, stems and leaves increased with the increase of nitrogen application rate. Leaf nitrogen content and seedling height, diameter, dry weight per plant and single net photosynthetic intensity, chlorophyll content was segmental regression between the linear correlation.