CAJ | 학술논문

通过野外模拟试验，研究了氮沉降增加对安徽祁门亚热带常绿阔叶林凋落物量及养分季节动态的影响。试验设计为对照（CK，0）、高氮（T1，100 kg· hm-2· a-1）、高氮＋磷（T2，100 kg· hm-2· a-1＋50 kg· hm-2· a-1）3种处理。通过1 a监测，结果表明：（1）中坡3种处理的年凋落量分别是6．87、5．48和6．72 t· hm-2，T1、T2处理一定程度上抑制了凋落物量的增加。坡顶3种处理的年凋落量分别是6．80、5．66和7．01 t· hm-2，T2处理增加凋落物产量，T1与之相反。（2）凋落物中各组分所占比例从大到小顺序为：叶＞枝＞花果＞杂质。（3）3种处理月凋落特征相似。（4）主要元素年均质量分数从大到小顺序为：N、K、Ca、Mg、P，落叶中主要养分质量分数最高。 T1、T2处理显著增加了凋落物N质量分数，增幅为7．81％～22．33％，且效果T2＞T1。 T1处理降低了P、K、Mg质量分数，T2处理增加了P、Mg质量分数，降低了K质量分数。从凋落量及养分含量两方面来说，向森林生态系统输入植物生长必需的营养元素可以缓解氮沉降的影响。
통과야외모의시험，연구료담침강증가대안휘기문아열대상록활협림조락물량급양분계절동태적영향。시험설계위대조（CK，0）、고담（T1，100 kg· hm-2· a-1）、고담＋린（T2，100 kg· hm-2· a-1＋50 kg· hm-2· a-1）3충처리。통과1 a감측，결과표명：（1）중파3충처리적년조락량분별시6．87、5．48화6．72 t· hm-2，T1、T2처리일정정도상억제료조락물량적증가。파정3충처리적년조락량분별시6．80、5．66화7．01 t· hm-2，T2처리증가조락물산량，T1여지상반。（2）조락물중각조분소점비례종대도소순서위：협＞지＞화과＞잡질。（3）3충처리월조락특정상사。（4）주요원소년균질량분수종대도소순서위：N、K、Ca、Mg、P，락협중주요양분질량분수최고。 T1、T2처리현저증가료조락물N질량분수，증폭위7．81％～22．33％，차효과T2＞T1。 T1처리강저료P、K、Mg질량분수，T2처리증가료P、Mg질량분수，강저료K질량분수。종조락량급양분함량량방면래설，향삼림생태계통수입식물생장필수적영양원소가이완해담침강적영향。
A field simulated test was conducted to study the effects of nitrogen deposition on litter production and nutrients of a subtropical evergreen broad-leaved forest in Qimen, southern Anhui.The treatments were designed as CK (0 kg hm2 · a-1 N), T1 (100 kg hm2· a-1 N) and T2 (100 kg hm2· a-1 N+50 kg hm2· a-1 P).For one year observation, annual litter production averaged 6.87, 5.48 and 6.72 t· hm-2 for CK, T1, T2 on the middle slope, respectively.High N deposition inhibited litter production.However, on the flat ridge, annual litter production averaged at 6.80, 5.66 and 7.01 t· hm-2 for CK, T1 and T2, respectively.T2 treatment increased the litter production compared with CK although no significant difference appeared between CK and T2.The litter components ranked by their amounts consistently are in the following or-der:foliage>branches>sexual organs>miscellaneous .The seasonal patterns of litterfall were similaramong the different treatments.Therefore, the nitrogen deposition can not change the eco-physiological characteristic of dominant trees.The nutrient input by litterfall is N>K>Ca>Mg>P.T1 and T2 treatments elevated the average N concentrations by ranging from 7.81%to 22.33%inthe litterfall comparedwith CK.T1 reduced the average concentrations of P, K and Mg, but nega-tively to T2 for P and Mg.The nitrogen deposition harms to litter production and its chemistry of this subtropical evergreen broad-leaved forest.In order to alleviate the adverse effect of high nitrogen deposition, other necessary elements should be input.