摘要: Magnetic measurements of soil and tree bark adjacent to a busy highway revealed significant variation in the concentration magnetic particles with distance from highway. Furthermore, forest-facing tree-bark contains significantly more than road-facing tree-bark. were detected both on maple trees first centimeter cover (O/A horizon). Stability Saturation Isothermal Magnetization (SIRM) hysteresis parameters indicates presence Single-Domain/Pseudo-Single-Domain (SD/PSD) carriers. Measurements SIRM detect lower coercivity component that we interpret be an indication abundant PSD-type grains. around perimeters eight trunks reveal carriers whose distribution is antipodal source direction (highway). We our observation by adopting air circulation model, where suspended PSD/SD are carried stream. The stream heavy traffic lowers amount moisture trunk surfaces facing thus reduces adhesive potential this side. Therefore, can stay moist side protected direct airflow. A signature rings was tested as paleo-climatic indicator. have examined wood sequoia tree, located Mountain Home State Forest, California, ring record spans over period 600–1700 A.D. measured low high-field susceptibility, Natural Remanent (NRM), (SIRM), stability against thermal Alternating Field (AF) demagnetization. investigation 200 mm long material suggests efficiency natural remanence (=natural remanent magnetization normalized saturation remanence) may sensitive paleoclimate indicator because it substantially higher (in average > 0.01=1%) during Medieval Warm Epoch (700–1300 A.D.) Little Ice Age (1300–1850 < 0.01=1%. Diamagnetic behavior has been noted prevalent regions density. mineralogical nature carrier not directly but maghemite suggested due absence Verwey transition. Tree density, along wood’s efficiency, records (LIA), which well documented Europe elsewhere. analysis reveals blocking temperatures near 200°C. This phenomenon origin controlled local conditions.
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