A field-scale experiment arranged in a complete randomized block design with three N addition treatments including a control (no addition of N), a low N (5 g m-2 year-1), and a medium N (10 g m-2 year-1) was performed...A field-scale experiment arranged in a complete randomized block design with three N addition treatments including a control (no addition of N), a low N (5 g m-2 year-1), and a medium N (10 g m-2 year-1) was performed in each of the three typical forests, a pine (Pinus massoniana Lamb.) forest (PF), a pine-broadleaf mixed forest (MF) and a mature monsoon evergreen broadleaf forest (MEBF), of the Dinghushan Biosphere Reserve in subtropical China to study the response of soil fauna community to additions of N. Higher NH4+ and NO3- concentrations and a lower soil pH occurred in the medium N treatment of MEBF, whereas the NO3- concentration was the lowest in PF after the additions of N. The response of the density, group abundance and diversity index of soil fauna to addition of N varied with the forest type, and all these variables decreased with increasing N under MEBF but the trend was opposite under PF. The N treatments had no significant effects on these variables under MF. Compared with the control plots, the medium N treatment had significant negative effect on soil fauna under MEBF. The group abundance of soil fauna increased significantly with additions of higher N rates under PF. These results suggested that the response of soil fauna to N deposition varied with the forest type and N deposition rate, and soil N status is one of the important factors affecting the response of soil fauna to N deposition.展开更多
The Hadamengou gold deposit, located 15 km west of Baotou city, Inner Mongolia （Fig. 1）, contains deep-seated faults and a large granite body. The deposit is hosted by the Neoarchean Wulashan Group metamorphic strata.
为了解九寨沟大气氮、磷和硫沉降的现状及对水体景观的潜在影响,于2010—2011年在长海监测了干湿沉降,于2011—2012年度在日则和沟口监测了全沉降。长海和沟口位于旅游线上,而日则为背景点。结果显示,长海SO2-4的年通量为8.67 kg S/hm2...为了解九寨沟大气氮、磷和硫沉降的现状及对水体景观的潜在影响,于2010—2011年在长海监测了干湿沉降,于2011—2012年度在日则和沟口监测了全沉降。长海和沟口位于旅游线上,而日则为背景点。结果显示,长海SO2-4的年通量为8.67 kg S/hm2,总无机氮(TIN)的年通量为3.04 kg N/hm2,都主要来自人为源。在总氮(TN)、总溶解性氮(TDN)、总磷(TP)和总溶解性磷(TDP)的全沉降方面,沟口和日则具有类似的特征,反映这两点的TN、TDN、TP和TDP全沉降主要受区域环境的影响,受当地旅游活动的影响相对较小。结合相关文献,发现氮沉降可能已超过九寨沟水体养分氮沉降临界值,湿沉降的TIN含量都超过我国自然保护区地表水环境TN的标准;过量硫沉降偶尔导致酸雨,威胁景观钙华的健康。为制定九寨沟的相关保护措施,今后有必要深入量化氮和硫沉降的来源及对水环境的影响程度。展开更多
基金Project supported by the National Natural Science Foundation of China (NO. 30270283)the "100-Talent" Project of the Chinese Academy of Sciences (CAS)the Director Foundation of South China Institute of Botany, CASthe Innovation Priority Project of CAS (No. KSCX2-SW-120).
文摘A field-scale experiment arranged in a complete randomized block design with three N addition treatments including a control (no addition of N), a low N (5 g m-2 year-1), and a medium N (10 g m-2 year-1) was performed in each of the three typical forests, a pine (Pinus massoniana Lamb.) forest (PF), a pine-broadleaf mixed forest (MF) and a mature monsoon evergreen broadleaf forest (MEBF), of the Dinghushan Biosphere Reserve in subtropical China to study the response of soil fauna community to additions of N. Higher NH4+ and NO3- concentrations and a lower soil pH occurred in the medium N treatment of MEBF, whereas the NO3- concentration was the lowest in PF after the additions of N. The response of the density, group abundance and diversity index of soil fauna to addition of N varied with the forest type, and all these variables decreased with increasing N under MEBF but the trend was opposite under PF. The N treatments had no significant effects on these variables under MF. Compared with the control plots, the medium N treatment had significant negative effect on soil fauna under MEBF. The group abundance of soil fauna increased significantly with additions of higher N rates under PF. These results suggested that the response of soil fauna to N deposition varied with the forest type and N deposition rate, and soil N status is one of the important factors affecting the response of soil fauna to N deposition.
文摘The Hadamengou gold deposit, located 15 km west of Baotou city, Inner Mongolia （Fig. 1）, contains deep-seated faults and a large granite body. The deposit is hosted by the Neoarchean Wulashan Group metamorphic strata.
文摘为了解九寨沟大气氮、磷和硫沉降的现状及对水体景观的潜在影响,于2010—2011年在长海监测了干湿沉降,于2011—2012年度在日则和沟口监测了全沉降。长海和沟口位于旅游线上,而日则为背景点。结果显示,长海SO2-4的年通量为8.67 kg S/hm2,总无机氮(TIN)的年通量为3.04 kg N/hm2,都主要来自人为源。在总氮(TN)、总溶解性氮(TDN)、总磷(TP)和总溶解性磷(TDP)的全沉降方面,沟口和日则具有类似的特征,反映这两点的TN、TDN、TP和TDP全沉降主要受区域环境的影响,受当地旅游活动的影响相对较小。结合相关文献,发现氮沉降可能已超过九寨沟水体养分氮沉降临界值,湿沉降的TIN含量都超过我国自然保护区地表水环境TN的标准;过量硫沉降偶尔导致酸雨,威胁景观钙华的健康。为制定九寨沟的相关保护措施,今后有必要深入量化氮和硫沉降的来源及对水环境的影响程度。
