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| 1 | 强度耕作对^(137)Cs、^(210)Pb_(ex)和有机质剖面分布的影响显示文摘很少有关于直接测定强度耕作侵蚀引起土壤退化过程的报道。我们的目的是确定应用137Cs和210Pbex直接定量评价耕作侵蚀对土壤有机质(SOM)坡面运移影响的可能性。我们在黄土高原陡坡耕地上进行了50次犁耕活动,并将与其相临的另一块陡坡耕地作为对照。在对照坡地不同坡位,137Cs浓度均匀分布于上部0~30cm土层,而210Pbex浓度在坡上部和坡中部随土层深度增加呈现线性递减,在坡下部呈指数函数递减。0~30cm土层中土壤有机质含量显著大于30cm深度以下土层,并在坡中部和坡下部呈现与210Pbex类似的土壤剖面分布特征。与对照坡地比较,50次犁耕活动导致坡上部、坡中部0~45cm土层的SOM含量分别降低了38%和47%,坡下部0~100cm土层中的SOM含量却提高了18%。坡上部土壤剖面中137Cs浓度的加权平均值从1.48Bq/kg降低到0.29Bq/kg,坡中部从2.53Bq/kg减少到0.33Bq/kg,坡下部从1.48Bq/kg提高到2.81Bq/kg。210Pbex浓度的剖面加权平均值在坡上部从27.71Bq/kg下降到6.15Bq/kg,在坡中部和坡下部分别从35.46Bq/kg和25.53Bq/kg降低到1.57Bq/kg和19.40Bq/kg。137Cs和210Pbex的剖面分布与SOM在p<0.001水平呈显著相关,相关系数R2值在对照坡地为0.81~0.86,在犁耕实验坡地为0.86~0.91。实验结果表明。 | 李勇 白玲玉 张兴昌 Lindstrom M L Bork H R | 2003 | 水土保持学报2003，17，3： | 3 |
| 2 | Evaluation of the sysmex UF-100 automated urinalysis analyzer显示文摘 | Ben-Ezra J Bork L McPherson R | 1998 | Clin Chem1998，44，： | 2 |
| 3 | Indian medicinal plants (Mexico) : Inhibitory activity on NF-kappa B as an anti-inflammatory model and antibacterial effects 显示文摘 | Bork P M Schmitz M L Weimann C | 1996 | Phytomedicine1996，3，3： | 1 |
| 4 | Metabolism and evolution of Haemophilus influenzae deduced from a whole-genome comparison with Escherichia coli显示文摘 | Tatusov R L Mushegian A R Bork P | 1996 | Curr Biol1996，6，： | 1 |
| 5 | Chemopreventive effects of green tea polyphenols correlate with reversi ble induction of p57 expression显示文摘 | Hsu S Lewis J B Borke J L | 2001 | Anticancer Research2001，21，6： | 1 |
| 6 | 查看详情显示文摘 | Coleman L E Bork J E Wyman D P | | 0，，： | 1 |
| 7 | Literature mining for the biol- ogist: from information retrieval to biological discovery 显示文摘 | Jensen L J Saric J Bork P | 2006 | Nat Rev Genet2006，7，： | 1 |
| 8 | Calcium pump epitopes in placental trophoblast basal plasma membranes显示文摘 | Borke J L Caride A Verma A K | 1989 | Am J Physiol Cell Physiol1989，257，2： | 1 |
| 9 | Cellular and segmental distribution of Ca2+-pump epitopes in rat intestine显示文摘 | Borke J L Caride A Verma A K | 1990 | Pflügers Arch Eur J Physiol1990，417，1： | 1 |
| 10 | Chemo preventive effects of green tea polyphenols correlate with reversible induction of p57 expression 显示文摘 | Hsu S Lewis J B Borke J L | 2001 | Anticancer Research2001，21，6： | 1 |
| 11 | Evaluation of the Sysmex UF-100 automated urinalysis analyzer 显示文摘 | Ben-Ezra J Bork L McPherson RA | 1998 | Clin Chem1998，44，1： | 1 |
| 12 | Association between the angiotensin-converting enzyme-insertion/deletion polymorphism and diabetic nephropathy:a methodologic appraisal and systematic review显示文摘 | Kunz R Bork J Fritsche L | 1998 | J Am Societ Nephrology1998，9，9： | 1 |
| 13 | Literature Mining for the Biologist: from Information Retrieval to Biological Discovery显示文摘 | Jensen L J Saric J Bork P | 2006 | Nature Reviews ( Genetics)2006，7，： | 1 |
| 14 | Evaluation of the Sysmex UF-100 automated urinalysis analyzer显示文摘 | Bork L Mcpherson RA | 1998 | Clin Chem1998，44，1： | 1 |
| 15 | Literature mining for the biologist: from information retrieval to biological discovery显示文摘 | Jensen L J Saric J Bork P | 2006 | Nature Reviews Genetics2006，7，2： | 1 |
| 16 | Evaluatiouof the System UF- 100 automated urinalysis analyzer显示文摘 | Ben-Ezra J Bork L McPherson R A | 1998 | Clin Chem1998，44，1： | 1 |
| 17 | Literature Mining for the Biologist: From Information Retrieval to Biological Discovery显示文摘 | Jensen L J Saric J Bork P | 2006 | Nature Reviews Genetics2006，7，2： | 1 |
| 18 | Evaluation of the Sysmex UF-100 automated urinalysis analyzer 显示文摘 | Ben-Ezra J Bork L McPherson RA | 1998 | Clin Chem1998，44，1： | 1 |
| 19 | Hypericin as a non-antioxidant inhibitor of NF-kB显示文摘 | BORK P M BACHER S SCHMITZ M L | 1999 | Planta Medica1999，65，4： | 1 |
| 20 | Evaluation of the Sysmex UF-100 automated urinalysis analyzer显示文摘 | Ben-Ezra J Bork L McPherson R A | 1998 | Clin Chem1998，44，1： | 1 |
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