XU Hao,CAI Jinjun,DONG Liguo,et al.Mixed Advantage and Mechanism of Armeniaca sibirica and Hippophae rhamnoides in Loess Hilly Region of Ningxia[J].Northern Horticulture,2021,(08):85-91.[doi:10.11937/bfyy.20202863]
宁夏黄土丘陵区山杏沙棘混交优势及其机理
- Title:
- Mixed Advantage and Mechanism of Armeniaca sibirica and Hippophae rhamnoides in Loess Hilly Region of Ningxia
- 文献标志码:
- A
- 摘要:
- 调查了宁夏黄土丘陵区山杏沙棘混交林生长状况和生物量，分析了混交优势产生的机理，以期为发展山区人工林提供参考依据。结果表明：山杏沙棘混交林中山杏平均树高比纯林高1747%，生物量比纯林高1277%，混交后山杏的树高和生物量均显著增加；混交林的林木固碳量是纯林的389倍。从生态功能来看，混交林土壤水分利用效率更高。混交林坡面径流量仅为纯林的251%，径流含沙量仅为纯林的597%，土壤侵蚀量仅为纯林的178%，混交林生态功能优势明显。由于沙棘根系可以与土壤中的弗兰克氏菌形成特殊的根瘤，并在根瘤中有效固定大气中游离的氮，因此土壤中氮素增高显然来自沙棘的根瘤固氮所补充的营养。沙棘与山杏混交以后，由于沙棘的根瘤固氮作用，大大增加了林地土壤氮素的供应。充足的氮素供应刺激山杏生长，因此其生长量和生物量均显著增加，林木覆盖度和林地固碳量均显著提升，表现出明显的生长优势。在生态建设中，该类型的混交林可作为固碳林推广应用。
- Abstract:
- The growth status and biomass of mixed forest of Armeniaca sibirica and Hippophae rhamnoides Linn.in Loess Hilly Region of Ningxia were investigated.The mechanism of mixed advantage was analyzed,in order to provide reference for the development of mountain plantation.The results showed that tree height of Armeniaca sibirica in the mixed forest was 1747% higher than the pure forest on average,and the biomass was 1277% higher than the pure forest.Carbon sequestration of mixed forests was 389 times to pure forests.And mixed forest had higher soil water use efficiency.The slope surface runoff of mixed forest was only 251% of that of pure forest,the sediment concentration of runoff was only 597% of that of pure forest,and the soil erosion amount was only 178% of that of pure forest.The ecological function advantage was obvious.Since the root system of Hippophae rhamnoides Linn.could form special root nodules with frankella in the soil,and effectively fix the free nitrogen in the air by root nodules,the increase of nitrogen in the soil obviously come from the nutrients supplemented by the nitrogen fixation in the root nodules of Hippophae rhamnoides Linn..After the mixture of Hippophae rhamnoides Linn.and mountain apricot,the supply of nitrogen in forest soil was greatly increased due to the nitrogen-fixing effect of root nodules of Hippophae rhamnoides Linn..Sufficient nitrogen supply stimulated the growth of the Armeniaca sibirica,so its growth and biomass increased significantly,showing an obvious growth advantage.In ecological construction,this type of mixed forest could be used as carbon sequestration forest for applying.
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备注/Memo
第一作者简介：许浩（1979-），男，博士，副研究员，现主要从事生态修复等研究工作。E-mail：hz92@163.com.基金项目：宁夏回族自治区重点研发计划资助项目（2020BCF01001）；宁夏回族自治区农业高质量发展和生态保护科技创新示范资助项目（NGSB-2021-14-02，NGSB-2021-11-06）；国家重点研发计划资助项目（2016YFC0501702，2017YFC0504602）；宁夏自然科学基金资助项目（NZ17132）；宁夏回族自治区“国内引才312计划”资助项目。收稿日期：2020-07-07