摘要
以科尔沁沙地樟子松与赤松人工林为对象,分析不同器官、凋落叶和土壤的C、N、P化学计量,比较研究两个树种的养分保存与利用机制。结果表明:樟子松叶C含量及C∶N、C∶P和N∶P、枝N含量以及根N和P含量显著高于赤松,而叶P含量、枝C∶N、根C含量及C∶N和C∶P显著低于赤松。樟子松N和P含量随枝叶年龄增加而下降,而赤松P含量表现为当年和二年生枝叶显著高于一年生枝叶。樟子松凋落叶C、N、P含量均显著高于赤松,C∶P和N∶P显著低于赤松。赤松叶片P重吸收效率显著高于樟子松,并且两个树种的P重吸收效率显著高于N重吸收效率。樟子松林土壤P含量显著低于赤松林,而C∶N和C∶P显著高于赤松林。樟子松养分主要供给新生组织器官,而老年枝叶的养分保存能力下降,凋落叶更易于分解,不利于土壤养分保存,土壤P含量较低。赤松养分保存能力更强,通过维持较高养分重吸收效率,提高体内养分利用效率,降低对土壤P的消耗。
We analyzed C, N, and P stoichiometry of different plant organs, needle litter and soils in Pinus sylvestris var. mongolica and Pinus densiflora plantations, aiming to explore their nutrient conservation and use mechanisms. The results showed that C concentrations, C∶N, C∶P and N∶P in needles, N concentrations in branches, and N and P concentrations in roots of P. sylvestris var. mongolica were significantly higher than those of P. densiflora, while P concentrations in needles, branch C∶N, and C concentrations, C∶N and C∶P in roots of P. sylvestris var. mongolica were significantly lower than those of P. densiflora. Concentrations of N and P decreased with increasing age of needle and branch for P. sylvestris var. mongolica, whereas P concentrations were significantly greater in current-year and two-year-old than one-year-old needles and branches for P. densiflora. Concentrations of C, N and P in needle litter of P. sylvestris var. mongolica were significantly higher than those of P. densiflora, while needle litter C∶P and N∶P of P. sylvestris var. mongolica were significantly lower than those of P. densiflora. P resorption efficiency of P. densiflora was significantly greater than that of P. sylvestris var. mongolica. P resorption efficiency was significantly higher than N resorption efficiency for both species. Soil P concentrations were significantly greater in P. sylvestris var. mongolica plantation than in P. tabuliformis plantation, whereas soil C∶N and C∶P were significantly lower in P. sylvestris var. mongolica plantation than in P. densiflora plantation. These results indicated that P. sylvestris var. mongolica tended to allocate more nutrients to newborn tissues, with declining nutrient conservation ability of old branches and needles. The needle litter was easy to decompose, which was not conducive to soil nutrient conservation, and soil P concentrations were low in P. sylvestris var. mongolica plantation. P. densiflora maintained higher nutrient resorption efficiency, and improved
作者
王凯
齐悦彤
那恩航
陶江
刘建华
康宏樟
WANG Kai;QI Yue-tong;NA En-hang;TAO Jiang;LIU Jianhua;KANG Hong-zhang(College of Enwironmental Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;School of Design,Shanghai Jiaotong University,Shanghai 200240,China;Liaoning Institute of Sandy Land Control and Utilization,Fuxin 123000,Liaoning,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2023年第2期274-281,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31400613)
辽宁省“兴辽英才计划”项目(XLYC1807017)资助。
关键词
养分限制
器官差异
养分重吸收
树种选择
科尔沁沙地
nutrient limitation
organ diversity
nutrient resorption
tree species selection
Horqin sandy land
